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Battery Tender Junior

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$39.95 - $43.95
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This product is legal in California only for racing vehicles which may never be used, registered or licensed for use upon a highway.

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.

Product Style RevZilla Item # Manufacturer Product # Availability
12 Volt 177707 0210123/021-0123 In Stock: Ships next business day
6 Volt 177698 021-0127 Out of Stock


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Doesn't fit or just not happy with it? You can return any new, unused and unaltered item within 30 business days of delivery receipt of your item. We will issue a full refund to your original payment method.

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Battery Tender Junior 4.8 5 83 83
Quick, Simple and Easy After reading previous reviews and having my bike stowed away for winter, keeping my bike's battery charge couldn't be any more straight forward. The directions were simple and charging time was faster than expected. The tender is small and easy to pack away when finished. Definitely the best bang for your buck with quick shipping as always from Revzilla. Grab one before they are gone! November 11, 2015
Worth the money Does what it's made to do, my bike runs brand new every time I run it, everything works perfectly and was super easy to install. Worth the money. July 20, 2015
Charges, tends with aplomb. Really like this. I have marine battery for my trolling motor and also my mc battery that i use this to keep in good shape. Excellent product. July 7, 2015
Simple to hook up and works great! This is kinda a set it and forget it device. just hook it up and plug it in and it keeps your battery charged without the worry of overcharging. June 22, 2015
does what it's supposed to do. Keeps batteries alive longer. Definitely cheaper than replacement battery. May 25, 2015
Excellent little necessity If you want to keep your battery in good condition during those long spells where you have to store your bike, this charger is exactly what you need. Revzilla have these on sale periodically and it is a very good buy. I also bought the larger model for my car that I park for extended periods. April 29, 2015
Perfect product to suit my needs. My 2014 Ninja 650 ABS came with a port that connects to the battery terminals as stock. This tender had the connection that I didnt need to get under the seat and to the battery. It was perfect! It has a long cord and easy to read led light. April 10, 2015
Best Bang for your Buck! just finished my first season with this tender and it works great! comes with everything you need,does not take up space in your garage, easy quick connects, and I feel like they should be charging more for its capabilities! March 23, 2015
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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: 17 Questions, 80 Answers
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RevZilla Store asked: Why did you choose this?
Kristen J: i have a battery on everything and never have to replace batteries Nov 13, 2015
Mitch F: just moved from Florida and needed this for the winters here in Tahoe Nov 12, 2015
Michael H: History with the Battery Tender product and reviews. Nov 9, 2015
James H: Checked on-line and had good reviews. Had rewards didn't cost me anything except shipping Aug 17, 2015
Joseph T: to keep my bike charged Aug 5, 2015
Christopher A: Winterize. Jun 5, 2015
Carmine C: I like that it is both a charger AND a battery tender once your battery gets to full charge. May 29, 2015
Michael A: I own several of these units and they have been working great for me, plus BatteryTender seems to be the original and have been around a long time so I feel comfortable with the company should I ever have a problem. Apr 29, 2015
kevin d: Keeps battery's topped off and ready to go when you are . makes battery's last longer. Apr 2, 2015
Brad H: Gotta keep that battery working during the winter. Apr 2, 2015
Charles W: Have purchased before, great,must have item Mar 19, 2015
Brian R: This charger comes with alligator clips, as well as the leads to attach a plug to the battery. It's convenient and has good reviews so I will try it out. Mar 18, 2015
JOHN R: to keep my battery charged.....DUH Feb 24, 2015
Richard H: Great reviews and great price Feb 20, 2015
samuel p: Battery charger in need for emergencies Feb 20, 2015
Gaylene G: I need a Tender for a car. Bought this one for my bike, and will put the one from my bike, on my car! Are you confused yet? Me too. Feb 13, 2015
JeQuan R: For prolonging the life of my bikes battery and keeping it charged throughout the winter. Jan 10, 2015
C I: I've always have had a battery tender on all my cars why not a bike, besides I've been noticing a battery drain on bike battery so we don't want to stuck anywhere. great buy Dec 28, 2014
Elliott K: My 2014 Kawasaki Ninja 650 ABS already has the tender port attached to the battery posts. Need to keep the battery charged while not riding in the winter months. Cost effective product to maintain the battery so it doesnt have to be replaced each spring! Thanks Revzilla! Dec 26, 2014
Argent P: I needed one... Dec 19, 2014
Scott E: For use when I just can't find the time to ride.... Dec 11, 2014
" ": Need it for winter time Dec 2, 2014
Steve B: I have one that works great, but I got tired of switching it between several motorcycles and a riding mower, so I ordered two more. Revzilla's price is cheap enough that it was less expensive to order several of these than ordering a new model that has multiple outlets on it. Nov 22, 2014
Richard S: good price, simplicity Nov 1, 2014
Dale S: reliable Oct 29, 2014
stephen g: reviews i have seen on this Oct 23, 2014
Jose C: Great way to keep the battery charge, during winter time. Easy to use plug and go. Oct 14, 2014
betty l w: Do not get to ride my new bike as much as I would like. Need to have my bike ready, when I'm ready. Sep 28, 2014
G O: good price to keep my baby juiced up over the winter Sep 27, 2014
Spencer B: Own 3 and love them. Aug 4, 2014
Robert O: My second battery tender. Great product that works perfectly. Never have to worry about a dead battery in the spring after a long winter. Just use it year round and your battery will last so much longer. Jul 18, 2014
Dmitry B: Basic battery tender - does what it is supposed to do. Great price! May 8, 2014
Johnathan B: Needed a trickle charger for my FZ6R. May 3, 2014
Amanda W: 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
Arthur J: 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
Answer this · Send to friends Good question? Yes (1) No (0)
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
Reply to mmmpies Good answer? Yes (1) No (0)
A shopper asked: Can you use a battery tender with a Shorai lithium battery?? May 13, 2014
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Joseph B: I believe so. I have a small collection of bikes, and everything that is a rider I leave on this tender, the Yuasa 1.25 model, and the Battery Tender 4 bank multi.
About 3 bikes have a Shorai in them, and i havent noticed a difference. They get switched around at times, depending on what Im riding.
Check with Shorai just to be sure, Id hate to give you bad advice, and Im not a battery expert!
Jun 17, 2014
Reply to Joseph Good answer? Yes (0) No (0)
Nicholas C: Yes, but you have to make sure to remove it from the charger once it is done charging. Lithium cells have lower self-discharge so keeping it on a "trickle charger" isn't generally necessary. See the Shorai website FAQ page for more info. May 13, 2014
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Greg L: Mine works very well with my stock 2011 BMW 1200 GS battery. Suspect that if it's 12 volt, everything should be okay May 13, 2014
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Mauro G: Yes you can it is safe May 14, 2014
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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
Answer this · Send to friends Good question? Yes (0) No (0)
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
Reply to Clint Good answer? Yes (0) No (0)
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
Reply to Greg Good answer? Yes (2) No (0)
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
Reply to LEROY Good answer? Yes (0) No (0)
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
Reply to Cy Good answer? Yes (0) No (0)
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: Do I get the 6 volt or 12 volt for my 2013 Harley V-Rod Muscle? Dec 27, 2014
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Ty P: I would imagine 12. I would check your manual or look at your battery. Dec 27, 2014
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Jason H: 12 volt is the standard charging system on the vrod. Dec 27, 2014
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Ian L: 12 Volt Dec 27, 2014
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Dakota P asked: Hello, i was wondering if this product is suitable to be left outside, like underneath a car port.? I am looking for a battery tender to use over the winter while my bike is in storage. Oct 15, 2015
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Gerald B: Mine stays outside all the time under a car port with no problem and we do get snow and rain with wind in Crestline and its been outside for over 2 years and still works like it should. I think if the temps got down to 0 then as Chris said take every thing inside. Mine has worked down to 18f. Nov 6, 2015
Reply to Gerald Good answer? Yes (0) No (0)
Chris L: Probably not. The AC transformer is not weatherproof. You could take the battery out of the bike and leave it in a covered area with the BT. Oct 16, 2015
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A shopper asked: can I use the battery tender jr. on my bike and my deep cycle batt. or would it damage something? Chip Nov 3, 2014
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Hassan M: I am fairly certain that you would be fine. It will charge the deep cycle battery to max Vm and then shutoff until V Nov 3, 2014
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Daniel K: This is perfect for the bike - I use one on all of my bikes. I don't see why one would not work on a deep cycle battery. Nov 3, 2014
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A S asked: would you use this everytime the bike isnt being used? and if not how long between rides until you need to? also do i need to buy anything extra to hook to a ninja 300? Oct 25, 2014
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Howie C: During ridding season and you only ride on weekends it would be safe to say your battery should hold up by not putting it on the charger during the week. A good battery will hold its own and its really how much draw your bike produces with the i.e. clock and other continuous running goodies it has. I have a x-country tour with the works so about every other week or two I put the charger on it for a couple days or so and it works out so Im not running the juice all the time, but my battery is always charged. AND REMEMBER..........a clean battery will also prolong a batteries life........even a dusty battery will create draw between the two post!!! Nov 3, 2014
Reply to Howie Good answer? Yes (0) No (0)
Matt Z: I ride so often during riding season I only use the battery tender when the bike is being stored during winter. I keep the battery in the basement plugged into the battery tender. You don't need anything extra for this to work on the ninja 300. Oct 27, 2014
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A S: And it's pretty easy to take the battery off? But say you only ride on the weekends during riding season would it be fine to not charge? Oct 27, 2014
cody m asked: Hello, I'm just wondering if I should purchase the 12V or 6V? I have a 2013 ninja 650. Oct 24, 2014
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william w: your bike has a 12v electrical system as do all modern bikes. Oct 24, 2014
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Ronald B: 12 Volt Oct 25, 2014
Reply to Ronald Good answer? Yes (0) No (0)
A shopper asked: Do they sell extra pigtails so I can hook them up to multiple bikes? That way I can just move the charger from bike to bike, and not have to mess with taking the leads off each time I move the charger. Oct 20, 2014
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Howie C: Thats the best part is you can get extra pigtails and mount them to your bikes so there is no taking covers or trying to access your battery........just plug into the pig tail you mounted in a non conspicuous place and charge AND when your done unplug put the cap on and go! Soooo easy!!! Nov 3, 2014
Reply to Howie Good answer? Yes (0) No (0)
BOB K: Yes, just search s.a.e. to whichever hook up you are looking for. (i.e. Search s.a.e. to alligator clips) Nov 3, 2014
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A shopper asked: Can this tender be used on cars and bikes? And does it include everything I would need to charge either of them? I wouldn't need to buy any adapters or extra cords right? Dec 5, 2014
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Theodore E: It includes everything you need for a bike. But, I have never used it for a car and I don't know that it would work for a car. I would dig into that part further with the manufacturer. Dec 5, 2014
Reply to Theodore Good answer? Yes (1) No (0)
A shopper asked: Hi, just put a 6V trickle charger into my cart, but not sure if this is what I need. I have a Suzuki GZ 250. Is the 6V right or should I get the 12? Oct 23, 2014
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Nicholas G: 6V is more than enough you do not need a 12v. Oct 23, 2014
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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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Muhammad A asked: what is the difference between "Battery Tender Junior" and "Battery Tender Junior HE" ? Nov 13, 2015
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