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Battery Tender Junior

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Battery Tender Junior Charger - 6V and 12V

The Battery Tender® Junior is much more than a trickle charger. It has a brain. It's lightweight, compact, and fully automatic; very easy to use, especially in small spaces. It will keep your battery fully charged so that it is ready to go when you are!


  • Perfect for all lead-acid, flooded or sealed maintenance free batteries (AGM and gel cell)
  • Complete 4-step charging program (Initialization, Bulk Charge, Absorption Mode, Float Mode)
  • Automatically switches to float / maintenance voltage after fully charging the battery
  • If the battery voltage drops too far under load, full charger output power resumes
  • Solid state two color LED indicates stage of charger
  • Spark-proof
  • Reverse polarity protected
  • 12' output cord
  • 5 year warranty

Note: For California & Oregon customers please see Battery Tender Junior High Efficiency model.


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Battery Tender Junior 4.8 5 46 46
reliable-trouble free- enough said It works as advertised this is my second one. Inherited first one from Uncle it went kaput after several years. Replaced it with same brand as the old one was what was needed, this one so far keeps my bikes batteries up to snuff. April 22, 2014
I love it! I've got the battery end of the cable wired in and the SAE plug ran up near the speedo so I can just plug her in whenever I feel she needs a charge. The alligator clips included are big enough to also hook it up to a car or mower battery so it's definitely going to be used. April 21, 2014
Works great Got this when I replaced my factory battery on my 07 Z1000. Works great for a bike battery, love the quick connectors you can put on the battery itself. When I know I am not riding for awhile, it's easy to just pop the seat, install the connector and plug it into the wall. Great product and adds years to your battery! March 31, 2014
Most common for a reason The included stay on charging port is great. I installed this on my GS500 that I was originally using with a clamp on battery tender. Now, instead of removing the seat and clamping on the battery charger I can just plug it in and go. With multiple motorcycles they don't all get ridden regularly so a charger is a must. March 25, 2014
It just works. Used the o'rings and ran the wire down inside the fairing so I could leave it unattended. Less the 24 hours later, solid green indicator! March 12, 2014
Inexpensive efficient tender This little battery tender worked great, I just pulled my battery off the other day to go for a ride and it was better than when I took it out of my bike! and its staying that way too. It was a great way to store my battery for the winter ( or any extended period of time). March 4, 2014
Simple but effective The battery tender junior is a must-own for any rider, especially those living in colder climates where a bike is in storage for an extended period of time. Very easy to use, just plug it in, connect the clamps to the battery and let the tender do its thing. Once it's done charging it goes into float mode, giving the battery juice as needed. The cord is around 10', giving a little flexibility with finding an outlet. Overall great product at a more than reasonable price! February 17, 2014
Good product, maybe offer two applications? Good quality product, but I modified mine. As received, with the fuse block right next to the battery connections, all that "bulk" would not fit under my battery cover. So, I just re-routed the fuse block. I moved the fuse block next to the plug in. No big deal really. Just make a cut and reconnect with shrink wrap. Would be nice if they would offer both applications. Overall, I'm happy with the product and it works like a champ. January 27, 2014
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Have a functionality, fit, or otherwise product-specific question about the Battery Tender Junior? Ask it here! If you have a customer service or shipping question, please direct it to our Customer Service department.

Battery Tender Junior
Already Asked: 7 Questions, 27 Answers
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RevZilla Store asked: Why did you choose this?
John D: Budget maintenance! Good price on this one. Apr 19, 2014
Jim L: Winter Storage Feb 12, 2014
Shanley J: Needed a simple and easy tender. Nothing fancy. So far, this fits the bill. Jan 30, 2014
David M: Just need a basic charger.... Jan 12, 2014
Domenico S: Good reviews Jan 11, 2014
Ken V: Per technical data and price Dec 16, 2013
William C: need a simple easy to use battery maintenance device to keep my bike battery from draining over the winter Dec 11, 2013
Rhett V: The battery tender junior is a great product to use even if you ride your bike daily. It will truly increase the life of your battery by plugging it in everyday. Dec 1, 2013
Lakiri H: Had to have a tender! Nov 25, 2013
A E: Price, features, and quality reviews. Nov 10, 2013
Howie C: I have one similar that works great, so I purchased this one for my second bike. I like the reviews that it has and that it does what its designed for. Nov 8, 2013
Victor L: Just bought a new Harley and needed a reliable tender Oct 14, 2013
John R: Value and history in the business. Oct 11, 2013
Wilson L: Needed another one for another bike during winter storage. Have used BT chargers for years, always work great. 5+ yrs on MC batteries when I run these over the winter. Sep 24, 2013
NHA N: owning this at the moment! just need more units for other bikes. Very happy with it! Aug 28, 2013
A shopper asked: There is a port to connect with a charger. Does this charger have the proper lead for this mototcycle? The manual says NOT to charge the battery (unless thru the port) .That means taking off the seat,etc, etc. If it comes with the lead great, or include one if you fill this order,ok? Thanks lorin Jul 10, 2011
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mmmpies: It doesn't - you'll have to buy a powerlet adapter if you want to plug in to the port. Note that if you go this route, there's a key on/off procedure you'll have to follow or the port will shut off and the battery won't receive a charge.

Anyway, I've had six BMWs, two with CANbus electronics whose manuals included the same disclaimer you mentioned. I was wary too, but after some research I found I was able to safely use the Battery Tender with it's included harness kit to charge directly to the battery, which I did. Note that Battery Tender ships two different harness kits; one with an in-line fuse, one without (I think the BT Jr. doesn't have the in-line fuse). I recommend only using the fused model.

BMW sells an OEM branded charger you can plug directly in to the factory powerlet, but many prefer the Battery Tender and think it's a better product. I'm one of them, as are quite a few good staffers I know at BMW dealerships around the country.

If you'd like more info, you'll find a lot of chatter on this topic on sites like ADVrider and other BMW specific forums - just do a Google search.
Jul 11, 2011
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A shopper asked: I need a battery tender to use on my bike. I have a 2008 Kawi zx10r. I like this one but i'm not sure which voltage to get. I assume this would work and the voltage should be 12V but can someone please confirm for me?

Thank you
Feb 16, 2014
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Clint S: If it previously had a Deltran battery tender then this will plug right into the port underneath the passenger seat. If it was not a Deltran it's ok because this will come with a new port you can hook up to the battery and run up underneath the passenger seat, making it easy to connect and disconnect. Oh and yes 12v is the way to go, have one these for my 09 GSXR 750 and 07 R6, they work great! Feb 23, 2014
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Tyler S: This would not be a direct connection to the battery, but to the cable/port under the passenger seat. I need something that can work when connecting to that. Feb 16, 2014
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Jonathan c: Yes this will work for the zx10r. Dont hesitate this is on of the best things i did for my k6 gsxr 1000!! Feb 17, 2014
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Daniel K: Yes, you need the 12V one. I use that one for all my bikes. Works flawlessly! Feb 17, 2014
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Andre D asked: Hi all, i ll be using this product in the UK where power is 240v. Will this charger work or does it work only with 120v? Dont want to buy it and burn it as soon as i plug it :). Thanks Oct 29, 2013
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Greg L: Andre,

Absolutely 120v only! I live in Germany. I bought two Juniors and plugged them into a 120 v converter. Both blew, but fortunately the manufacturer replaced them. The converter has worked well for 3 years with all other 120 v appliances. Then I bought the waterproof 800 - works well with all voltages - that's what you want!
Oct 29, 2013
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LEROY B: There is a 240 volt version available. I use the charger in South Americe where the voltage is also 240v. However I have a 110v unit and I use a step down transformer.The 240v unit was not available when I purchased my charger. Dec 22, 2013
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Cy S: You definitely cannot just plug it in. Zoom in on the picture, it says 120V @ 60hz. Not sure if you might have issues with a converter in the loop.

(Also, mine at home says 120VAC @ 60Hz 12W)
Oct 29, 2013
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Robert H: I am not sure. There might be a converter/adapter. I lost the manual. Apologies for not being able to give a better answer. Oct 29, 2013
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A shopper asked: Does the wiring harness have an inline fuse or is that harness a separate accessory? Feb 17, 2013
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RevZilla: Both the wiring harness and alligator clip harness have in-line fuses. Feb 19, 2013
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A shopper asked: I own both a 2009 and a 2010 kawasaki klx250s Jan 19, 2013
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RevZilla: All Kawasaki KLX250's would use the 12v Battery Tender as they use a 12v battery and electrical system. Jan 21, 2013
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A shopper asked: how long is is the battery wiring harness that comes with this? Jul 26, 2012
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RevZilla: The battery wiring harness that comes with Battery Tender Super Smart Battery Tender Jr. is about 2ft. long. Jul 30, 2012
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Product Style RevZilla SKU ID Manufacturer Product # Availability
12 Volt 177707 021-0123 In Stock: Ships within 24 hours
6 Volt 177698 021-0127 Available: Usually ships in 1-2 business days