Best Battery Tender for Harley-Davidson: Amps, Lithium and What the Lights Mean

Chemistry: lead-acid, AGM, flooded and gel. NOT lithium - this model has no LiFePO4 profile.

The default answer in this category, and the ratings explain why: roughly fifty thousand reviews at 4.8 stars is the largest body of evidence on any powersports maintainer sold.

It is a maintainer in the strict sense. 750 mA holds a healthy battery through a winter and does it safely, with a float stage that will not cook the electrolyte. What it will not do is resurrect a flat battery in any useful time, and a Road King owner found that out the hard way after a long winter: 750 mA left him without enough reserve to crank.

The 12-foot cord plus the SAE pigtail is the reason people keep buying them. Bolt the harness to the battery once, leave the plug where you can reach it, and connecting takes two seconds for the next twenty years. One owner reports his previous Harley-branded unit ran for exactly that long before it needed replacing, and this is what he replaced it with.

Right for a Sportster, a Softail, or any Harley with a 12 to 19 Ah AGM battery that gets parked in good condition. Undersized for a Touring model with a 28 Ah battery, and completely wrong for lithium - the 800 mA version a few dollars up the range is the one that handles both.

What owners say: “I have used Battery Tender chargers for many years, mostly on motorcycle batteries, with good results: quick starts, longer battery life, less maintenance. - Rick Park”

Chemistry: lead-acid, flooded, AGM and gel. NOT lithium - for LiFePO4 in this current class use the 022-0199 Junior.

This is the one Harley forums point at when someone asks whether the dealer charger is worth the money. The reports are consistent enough to be worth reading in full.

A 2010 CVO Street Glide owner: "I read on some of the forums that these were just as good and for the same style about half the price. It operates the same and looks very similar." A 2018 Fat Boy owner who plugged it into the factory port: "This has the correct polarity. Some internet research says it's the very same one Harley sells, but they have a 3 week lead time." And a third, more bluntly: "Use this to replace a Harley Davidson charger. Couple weeks in and works so much better."

The extra current over the Junior is the practical reason to choose it. A Road King owner: "My old HD branded tender was getting old and at 750ma it didn't have enough reserve power to help crank the engine." 1.25 A is the size that actually brings a Big Twin battery back overnight rather than just holding it.

One warning that belongs on this listing rather than buried in the reviews. An owner reports boiling water out of a Harley battery left connected for a couple of months. That is a flooded-battery outcome on a unit without temperature compensation. On a sealed AGM battery, which is what almost every modern Harley ships with, it is far less of a concern - but if yours has removable caps, check the level.

What owners say: “My old HD branded tender was getting old and at 750ma it didn't have enough reserve power to help crank the engine on my Road King. - Ken Ross”

Chemistry: lead-acid, flooded, AGM and gel. NOT lithium.

The heavy-duty version of the 1.25 A Plus: metal case, continuous-duty construction, temperature-compensated absorption instead of a fixed voltage. It is the one that goes on the shelf and stays there for a decade.

An owner five years in on a single unit, and another in Latin America keeping an Indian Scout connected permanently through long periods of not riding - the reports skew toward long service rather than dramatic performance, which is the correct shape for a storage charger.

Two things to know before ordering. The Amazon price on this part number swings wildly because there is no Amazon-fulfilled buy box, and third-party sellers list it far above what a dealer charges. Check the 022-0211 above at the same current before paying a premium here. And the listed dimensions are wrong: an owner measured it at ten inches, not the seven and a half in the specification, which matters if you planned to tuck it into a fairing pocket or a saddlebag.

The status LED has the same weakness as the rest of the Deltran line - it can show a charged state on a unit that is unplugged or not actually charging. Verify with a meter rather than trusting the colour.

What owners say: “I had been using my Battery Tender Plus 12V 1.25 AMP Charger and Maintainer for the last five years to maintain my 2001 Honda. - R. Scott”

Chemistry: AGM, gel, standard, starter, deep-cycle AND LiFePO4. It detects which and picks the program itself.

The cheapest way to remove the lithium problem entirely. Duo means automatic chemistry detection: there is no mode button, so there is no wrong button. If you have one bike on AGM and another on lithium, or you plan to upgrade the battery at some point, this unit does not care.

That single design decision is worth more than it sounds. Every switchable charger in this guide is one forgotten button-press away from running a lead-acid float into a LiFePO4 pack, and the reviews are full of people who found that out afterwards. Endorsed by the lithium makers themselves - Antigravity, Super-B and EarthX - which is not something a lead-acid charger gets.

A Harley owner: "Perfect addition to keep my Harley battery charged. Kicks butt and its a most have! Easy to install and easy to use." Another: "I leave it on the tender anytime I'm not riding and it has been great."

The limit is right there in the specification. 0.6 A is the gentlest current here, and it is maintenance only. An owner states it flatly: "This one will NEVER charge a dead battery." Buy it to hold a good battery, and buy something bigger if you need recovery.

What owners say: “Perfect addition to keep my Harley battery charged. Kicks butt and its a most have! - STP”

Chemistry: 12 V AGM, gel, standard, starter and deep-cycle. NOT lithium - the desulfation pulses are exactly what a LiFePO4 pack must not see.

The best-selling motorcycle-specific charger in the world, and the reason is the battery test rather than the charging. OptiMate runs a diagnostic before and after the cycle and tells you whether the battery actually held it. That is the difference between finding out in November that a battery is finished and finding out in April on the driveway.

The desulfation step recovers neglected lead-acid batteries, and at 0.8 A it does it slowly and gently. One owner who had been fighting a cheap charger: "Before I had a cheap charger around 30.00 and was wondering why I couldnt keep a charge. After changing out - man!" Another has run the same unit since 2017.

Be honest about the desulfation claim, because the reviews are split. Several owners call it marketing: "Claims it will bring back a dead battery. BALONEY." A sulfated battery that is merely tired can often be recovered; one with a shorted cell cannot, by any charger. Treat recovery as a bonus rather than the reason to buy.

The hard limit is chemistry. This model has no lithium mode, and its pulses make it actively dangerous to a LiFePO4 battery. If there is any chance of a lithium upgrade, buy the 1 Duo or 2 Duo instead.

What owners say: “OptiMate 3 is my go-to for a battery tender on my motorcycles during the winter. It extended the battery life. - Amazon Customer”

Chemistry: AGM, gel, SLA, VRLA, flooded, maintenance-free, deep-cycle, marine, powersport AND lithium LiFePO4. Lithium mode must be selected with the mode button each time. Connector: X-Connect, NOT SAE - a Harley needs the GC009 adapter.

5 amps is what Harley specifies for current Big Twins, and this is the unit that does it for roughly half what the dealer asks. The evidence is direct rather than inferred.

A 2025 Road Glide owner: "I use it on my 2025 Roadglide and it works perfectly. The dealer told me to use the Harley charger which is double the price." A 2024 owner: "I have a new 2024 Harley Davidson and they recommend a 5A charger. This is very nice quality and does the job it's intended for."

On a 28 Ah Touring battery, 5 A is the difference between a flat battery coming back in hours and coming back over two nights. Add the thermal sensor that raises voltage in a freezing garage and lowers current in a hot one, and Force Mode, which starts charging a battery at 0 volts that every ordinary maintainer refuses to even see.

Now the part that generates the complaints. It ships with NOCO's X-Connect, not SAE, and there is no SAE adapter in the box. Every Harley owner hits this, phrased almost identically each time: "It supposed to be wonderful but it DOES NOT come with an SAE Adapter so if you want to use this on your Harley Davidson you'll have to order it separately." Add the GC009 to the same order and the total is still well under dealer money.

There is also no printed manual and a single mode button that is not self-explanatory. Watch a two-minute video before you plug it in, and check the mode after every power cut.

What owners say: “I use it on my 2025 Roadglide and it works perfectly. The dealer told me to use the Harley charger which is double the price. - Chris, 2025 Road Glide”

Chemistry: AGM, flooded, gel, marine, deep-cycle AND lithium LiFePO4. Lithium mode is selected manually. Connector: X-Connect, NOT SAE - add the GC009 for a Harley.

The sweet spot for a Sportster, Softail or Dyna. 2 A recharges a small powersports battery overnight and is still gentle enough to leave connected all winter, and at $45 it does more than chargers costing twice as much.

The long-term reports are the persuasive ones. An owner running one on a lithium battery: "The first has been running flawlessly, nonstop, for 4+ years, keeping the lithium replacement battery on one of my motorcycles topped up." Four years of continuous connection is the actual test of a maintainer, and this passed it.

Temperature compensation, an IP65 case, Force Mode from 0 V, and a genuine lithium profile - the feature list at this price is the reason the GENIUS line took over the category. It also reconditions the battery every 24 hours while maintaining, rather than sitting on a fixed float voltage.

Same two caveats as its bigger brother. X-Connect instead of SAE, so order the GC009 alongside it. And there is a real reliability question at the one-year mark: repeated "didn't even last a year" reports, and one owner who returned three units in a row because they would not switch into maintain mode after a full charge. Register the warranty and check the LEDs monthly.

What owners say: “The first has been running flawlessly, nonstop, for 4+ years, keeping the lithium replacement battery on one of my motorcycles topped up. - Kindle Customer”

Chemistry: AGM, gel, standard, starter, deep-cycle AND LiFePO4 - the charger identifies which and runs the right program. No mode button.

The 2 A Duo, and the one to buy if you want the GENIUS2's current without the GENIUS2's risk of a wrong button press. It reads the battery, decides whether it is lead-acid or lithium, and runs the correct program. An owner: "It recognizes the battery type automatically and adjusts accordingly." Another: "Well made and saved my Lithium Ion motorcycle battery."

The OEM story is instructive. A Triumph owner: "It is exact the same as Triumph sells as their OEM but half the price without their logo." Exactly the pattern Harley owners describe with Deltran units - the manufacturer buys the charger in and adds a badge.

It also does real recovery work: the battery-saving step brings back deeply discharged and sulfated batteries that a plain maintainer will not start on, on both chemistries. And it halts and warns on a battery with a bad cell rather than pushing current into it.

Fully sealed and weatherproof, which is the right build for a bike that sits outside under a cover. The reservations are cost and sample size: roughly twice a GENIUS2 with the same 2 A and no display, only 111 ratings, and the 2-bank version has a run of reports of one dead bank. Buy the single-bank.

What owners say: “It is exact the same as Triumph sells as their OEM but half the price without their logo. - Fabio Castro”

Chemistry: lead-acid, AGM, gel and lithium - chemistry is set on the unit, so select it before connecting a LiFePO4 pack.

4 A in the Deltran range, which means SAE out of the box - no adapter, no X-Connect, straight into the pigtail already on your Harley. For an owner who wants Touring-sized current without buying into the NOCO connector system, this is the shortcut.

It is fast enough to bring a flat AGM Harley battery back in a few hours, then drops into float and stays there. Eleven feet of combined reach is the longest stock cable set in the line, and the five-year warranty is the longest on any Deltran charger here. Switchable voltage and chemistry means it also covers a vintage 6 V machine and a lithium upgrade.

The reason it is not the top pick in this section is a pattern in the reviews that a Harley owner should read before buying. A rider who bought two: "I got 2 of these to put on my 2 motorcycles when I put new batteries in them. Come back and they are completely dead and the battery tender is saying it's charging." The unit had stopped working while the indicator continued to report a charging state, and two new batteries were ruined.

That failure mode is not unique to this model, but it appears here more than elsewhere. If you buy it, do the monthly meter check. Around 13.2 to 13.6 volts at the terminals means it is working. The light on the case means nothing.

What owners say: “I have a lot of batteries. Some of these see infrequent use. Reliable clean and safe power to keep batteries healthy. - davido”

Chemistry: AGM, flooded, gel AND lithium LiFePO4. The lithium mode is selected by button and must be set manually, or it runs the lead-acid profile.

The cheapest lithium-safe charger in the guide, and about seventeen dollars more than the lead-acid-only Junior it sits beside on the shelf. An owner of the 750 mA version who worked it out afterwards: "I am surprised this model will charge AGM however it will not charge lithium. At the time I bought this you can pay $10 more and get the 800mA version that does both."

That is the whole case for it. If there is any chance you will upgrade to a lithium battery in the life of this charger, the extra money is trivial insurance. Same Junior housing, same SAE ecosystem, same 12-foot cord - pigtails and extensions swap straight over.

The lithium mode uses a lower float so it can sit on a LiFePO4 pack over winter rather than parking the cells at 100 percent. Another owner checked before rather than after: "This was one of the few chargers my battery maker said was safe to use, I have a lithium battery in my motorcycle that I don't want to damage."

Two real problems. The mode is a button, which means it is a thing you can forget after a power cut. And there is a pattern of silent failure at twelve to eighteen months: "Worked for a year and a half and only noticed it stopped working when my motorcycle battery died that it was suppose to be tending." Check the mode and the voltage monthly.

What owners say: “Great battery tender, works with lithium ion and lead acid batteries. Keeps my car and motorcycle charged. - John”

Chemistry: lead-acid, AGM, gel AND 12 V lithium LiFePO4. Note: the 6 V lithium setting does not work in practice - see the cons.

Two A with both voltage and chemistry selection, and a seven-year warranty, which is the longest of anything in this guide by a margin. One charger covering a 6 V vintage battery, a 12 V AGM Harley battery and a LiFePO4 upgrade is a lot of coverage for sixty dollars.

The combo cable in the box has both ring terminals and clamps, so there is no extra pigtail purchase - a small thing, but it is the accessory people forget and then wait a week for. Slim wall-mountable case, 2 A that recharges a flat powersports battery meaningfully faster than the 800 mA Juniors while staying safe to leave connected.

The honest caveats. The 6 V lithium position is advertised by the selector but does not work: "Nice little charger - BUT it DOESN'T CHARGE A 6 VOLT LITHIUM BATTERY! Like you would expect - with those selection buttons." Twelve volt lithium is fine, which is what a Harley uses, but do not buy it for a 6 V lithium pack.

There is also a cluster of early failures, some just outside the Amazon return window, and battery detection that can hang in a permanent charging state. With only 265 ratings there is not much long-term data yet. The seven-year warranty is the thing that makes it worth the risk - use it.

What owners say: “I've never had a Battery Tender brand battery maintainer that let me down. Thrilled with the included cables and the polarity protection. - Mike Ragonese”

Chemistry: LiFePO4 / LFP 4-cell only. It has NO lead-acid mode at all - it will not charge the AGM battery in your other bike.

Lithium only, which sounds like a limitation until you realise it is the feature. There is no lead-acid button, so there is no way to run the wrong profile into a $300 battery. That is the main reason owners kill lithium packs, and this design removes it completely.

The other reason to buy it is the BMS wake-up. When a LiFePO4 pack is drained far enough its management board latches off and the terminals read zero volts. Every ordinary smart charger then refuses to start, because 0 V is how a charger decides nothing is connected. This one wakes it. An owner: "Even saved a battery on a bike i bought from a friend that was completely depleted of power. It is still holding a charge 1.5 years later." Another, on the charger she was using before: "The other lithium ion tender I was using previously was not able to charge the battery because it had gotten so drained."

Named by Shorai as the charger for its 2022-onward batteries, and it terminates in SAE, so it plugs straight into a pigtail a Battery Tender already left on your bike.

The complaints are fair. Seventy-seven dollars for 0.8 A is a lot next to a GENIUS2 that does 2 A plus lithium for forty-five. The status LEDs are cryptic enough that owners cannot tell at a glance whether the battery is full. And there are reports of a fragile connector pin. Buy it for the wake-up capability and the impossibility of choosing wrong, not for the specification sheet.

What owners say: “Even saved a battery on a bike i bought from a friend that was completely depleted of power. It is still holding a charge 1.5 years later. - Don Gores”

Chemistry: LiFePO4 / LFP 4-cell only. No lead-acid or AGM profile of any kind.

The touring-size version of the lithium-only OptiMate. Six amps is the fastest lithium-safe rate here, and on a Harley LiFePO4 pack that means flat to full in about an hour rather than overnight.

It carries the same BMS wake-up as the 0.8 A model, plus TUNE mode: a stable holding voltage for ECU flashing. That is a genuine Harley use case - a dealer or a tuner working on the bike with the ignition on for an extended period needs the voltage held steady, and a normal charger cycling through stages will not do it.

Owner reports are short but consistent. "I have a lithium ion battery on my motorcycle and it has kept the battery perfect." And from a user with expensive aviation-grade packs: "Works flawlessly with my EarthX batteries. A serious charger for the new world of Li batteries. Very robust, you get what you pay for."

At $155 this is not a general recommendation. It makes sense if your lithium battery cost several hundred dollars, if you tune, or if you want charging fast enough to be practical rather than overnight. If you just want a lithium pack maintained through winter, the 0.8 A TM-471 or a GENIUS2 in lithium mode does that for a fraction of the money. Note also the small review base - 42 ratings is not much field data.

What owners say: “Works flawlessly with my EarthX batteries. A serious charger for the new world of Li batteries. Very robust, you get what you pay for. - Mike”

Chemistry: AGM, gel and standard 12 V from 4-60 Ah, plus a separate LiFePO4 program for 2-15 Ah packs, selected as program 3 or 4. Includes a 12 V DIN/CAN-bus plug as well as SAE.

The recovery specialist. It will start on a battery at 0.5 volts, which is the deepest threshold of anything in this guide, and it does it on lead-acid and lithium both. If you have a battery a normal charger refuses to acknowledge, this is the unit that gives it a chance.

It also tests, before and after, and tells you whether the battery actually held the charge. That is the same feature as the OptiMate 3 but applied across both chemistries, and it is the answer to the question people really have in November: not "is it charged" but "will it still be good in April".

An owner: "I needed this one for my new motorcycle that has a Lithium-ion battery to keep the charge maintained over the winter." Another running mixed chemistries: "This unit fills the bill, and I can use it on my AGM batteries as well as the Lithium batteries."

The 1.25 A output is deliberate. This is a recovery and storage charger, not a fast charger, and it will not refill a 28 Ah Touring battery quickly. At $105 for that current it is the most expensive maintainer per amp here, and the CAN-bus features that justify part of the price are wasted on a Harley that charges through an SAE pigtail. Buy it for the recovery threshold and the testing; buy something else if you want speed.

What owners say: “This unit fills the bill, and I can use it on my AGM batteries as well as the Lithium batteries. - JLG”

Chemistry: AGM ONLY. Not intended for flooded batteries, and absolutely not for lithium - the pulse waveform has no place on a LiFePO4 pack.

The only charger here that desulfates the entire time it is connected rather than running a one-shot repair mode. The patented high-frequency pulse works continuously through all five stages, and the claim is up to four times battery life. Well regarded in the aviation world and among Odyssey and Optima owners, which is a demanding audience.

Its second real virtue is the AGM-specific voltage profile. The wrong absorption voltage is what kills AGM batteries early, and a charger built for a generic lead-acid curve is a compromise on the AGM battery your Harley came with. This one is not a compromise; it is AGM or nothing.

Built-in ambient temperature sensor, and owners use it exactly as intended: "On days the garage gets below freezing I keep it plugged in 24/7 with no issues. It's been 0 degrees."

Two caveats worth weighing. Some owners measured the float voltage as too low for the AGM batteries it targets, which is an odd result for a charger whose whole point is the correct AGM profile. And it is physically large, nine by eleven inches, at $98 for 2 A, next to a GENIUS2 that does 2 A plus lithium for less than half. Buy it if you have an expensive AGM battery you intend to keep for years. Do not buy it if there is any chance of a lithium upgrade.

What owners say: “On days the garage gets below freezing I keep it plugged in 24/7 with no issues. It's been 0 degrees. - Amazon Customer”

Chemistry: AGM, sealed maintenance-free and flooded. The title also names lithium LiFePO4, but the specification bullets list only lead-acid chemistries - confirm the mode before connecting a lithium pack.

Two Harleys, one wall socket, roughly $43 per bank. The banks are genuinely independent, each running its own program, so a weak battery on bank one does not starve bank two - which is the difference between a real multibank charger and a splitter.

Each bank also has temperature compensation, which the single-bank Junior does not. In an unheated garage that is the feature that stops a flooded battery gassing off as the weather swings, and it is worth more than the extra bank to some owners.

The service records are long. One owner came back to update his review after nearly ten years of use. Another: "I have 2 batteries in my boat and 2 in my diesel truck. I installed the plug-in leads for easy, semi-permanent connection."

The reservations are about individual banks rather than the design. Quality control produces a share of units with one dead bank out of the box, and Amazon has pushed at least one buyer to Deltran rather than accepting the return. It is also vulnerable to mains events: "Lasted 3 months, then house power went out, and it knocked this completely out." Test both banks the day it arrives, while you can still return it. Note also the 3-step program - there is no separate absorption stage, unlike the 4-step single-bank models.

What owners say: “I have 2 batteries in my boat and 2 in my diesel truck. I installed the plug-in leads for easy, semi-permanent connection. - J. Kennedy, ten years on”

Chemistry: all 12 V lead-acid, flooded, AGM and gel, and the listing explicitly covers lithium LiFePO4 - each bank runs its own program, so mixed chemistries on one unit are supported.

Four independent 1.25 A banks from one box on the wall. If you keep three or four vehicles, this replaces four chargers and four outlets, and at roughly $71 per bank it undercuts four separate Battery Tender Plus units.

The mixed-chemistry support is the useful part for a collection: an AGM Harley battery on one bank, a LiFePO4 pack on another, a quad and a lawn tractor on the other two, each running its own program. Owners confirm it stays cool with all four banks working: "This is sitting in the garage charging four vehicles at all times. It is safe endurable it doesn't get hot."

Be aware of the reliability picture before spending $285. This specific model is the odd one out in Deltran's range for a number of long-time customers who have had good service from the single-bank units. The failures are early and total rather than gradual: one owner had "the very first one failed out of the box" and a replacement that "failed in 4 months". A two-year-plus report exists too, but the distribution is wider than it should be at this price.

The leads are also only about four feet, which will not reach three bikes parked side by side. Budget for extensions - and remember the 25-foot SAE extension is rated for about 2 A, which is fine here since each bank is 1.25 A.

What owners say: “This is sitting in the garage charging four vehicles at all times. It is safe endurable it doesn't get hot. - Mikec”

Works with GENIUS1, GENIUS2, GENIUS2X2, GENIUS2X4, GENIUS5, GENIUS10 and the older G750, G1100, G3500, G7200 and G4.

If you buy a NOCO for a Harley, you need this. It is not an optional accessory, it is the missing half of the product.

NOCO ship their chargers with X-Connect, their own connector. Your Harley has SAE, either from the factory charging port or from a pigtail bolted to the battery. Without this adapter the two do not meet, and the number one Harley-owner complaint on the GENIUS5 listing is exactly that discovery, made after the box arrives.

It also adds something the bare pigtail does not have: an inline 20 A micro-blade fuse. The connector body is watertight and safe to leave hanging under the seat all winter. One adapter also lets a single NOCO serve several bikes that already have SAE leads fitted: "This adaptor is very convenient when you already have an SAE plug installed on multiple bikes but bought the NOCO tender."

The resentment in the reviews is fair and worth repeating: "Why not put a regular sae end on charger to begin with?" On a $30 GENIUS1 a $16 adapter is close to absurd. But if the charger is right, the adapter is not the place to economise. Put it in the same basket and stop thinking about it.

What owners say: “This adaptor is very convenient when you already have an SAE plug installed on multiple bikes but bought the NOCO tender. - Mark”

Universal SAE. Bolts to the battery posts and lives on the bike permanently.

The part that turns charging from a ten-minute job into a two-second one. Bolt it to the battery once, route the SAE end out past the side cover, and you never touch the terminals again.

What makes this one worth choosing over the thin lead in the charger box is the conductor: 10AWG, heavier than most supplied pigtails, so there is no meaningful voltage drop even with a 5 A charger. There is an inline 15 A blade fuse protecting the bike if the SAE end ever shorts against the frame, and a weatherproof cap over the exposed terminals - which matters, because that plug carries a live positive pin all winter.

Two feet is the right length to get from a Harley battery box out to somewhere you can reach without tools. At nine dollars it is cheap enough to fit one to every bike in the garage, which is the correct approach if you are running a multibank charger.

One thing you must check before connecting anything. An owner: "The red is normally hot and black is normally ground. That is NOT the case. Be sure to check polarity before hooking anything up." Put a meter on it before you bolt it down. It takes ten seconds and it is the difference between a working setup and a blown fuse or worse.

What owners say: “The cables insulation is thick and the connections are decent quality and weather resistant. Reasonably priced. Functions as intended. - Tom”

Standard SAE, so it works with Deltran, OptiMate and NOCO via the GC009. NOT compatible with 6 V Battery Tender Plus units or those with white quick-disconnect plugs.

The solution to the complaint every charger in this guide generates: the cable is too short. Twenty-five feet means the charger lives on the workbench near the outlet and the bike parks wherever you actually park it.

Standard SAE at both ends, so it works across brands, and the quick-disconnect lets you unplug and roll the bike out without touching the battery. Available in 6 ft and 12 ft as well, and in 4-packs if you are wiring up a multibank setup.

Read this before you order, because it is the mistake people make. The wire gauge is undersized for higher-current chargers. An owner: "Gauge too small for charging at more than 2 amps for longer periods." That rules it out for a NOCO GENIUS5, a Battery Tender 4 A, or anything else above 2 A sustained. Each bank of a 1.25 A multibank charger is fine.

There is a better arrangement in almost every case: run a mains extension cord to the charger and keep the DC side short. Voltage drop over 25 feet also makes some chargers misread the battery - "could never get them to read right when attached" - and the moulded plug is fragile enough that owners report snapping it inside its own protective cap. At $42 for a cable, weigh it against a $10 outdoor mains extension.

What owners say: “I really needed to add an extension to my battery tender charger. I was having to move everything I ever wanted to charge. - Dava Elcano”