Battery Tender Junior

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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 

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!


  • Input: 120VAC / 60Hz 
  • Output: 12V / 750mA
  • 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.

4.8 / 5
Bang For The Buck
4.8 / 5
5 / 5
4 / 5
Fit & Finish
5 / 5
Product Style RevZilla Item # Manufacturer Product # Availability
12 Volt 177707 021-0123/0210123 In Stock: Ships next business day


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4.9 / 5.0
98 Reviews
5 Stars
4 Stars
3 Stars
2 Stars
1 Star
Bang For The Buck
4.8 / 5
4.7 / 5
4.9 / 5
Ease Of Install
4.9 / 5
Fit & Finish
4.9 / 5
4.7 / 5
Bang For The Buck
5 / 5
Everyone needs one of these.
Frankly I'm surprised I went so many years without one of these. I used to hook up the cheap little alligator clips for my no brand charger under my seat every night in the driveway back in the days when every bike I owned had some type of charging issue. Now I pull into the garage, hook up to a pigtail and don't worry about whether or not I'm going to be stuck with no charge in the morning. I guess that's part of being an actual adult.
May 12, 2014
2006 BMW F650GS ABS
Bang For The Buck
5 / 5
Great charger!
As far as I can tell this is just as good of a trickle charger as any other battery maintainer that I've purchased, seen, or used - maybe better. The unit comes with alligator clips and terminal o-ring connectors which can be tightened down underneath the battery terminals themselves. Either style has plug ends which can be disconnected from the charger itself, allowing for the battery-side connection to remain - which rocks. I use the o-ring style and when not charging I just tuck the connector up into the seat, barely visible.
December 16, 2013
Bang For The Buck
5 / 5
5 / 5
5 / 5
Fit & Finish
5 / 5
Great Charger
This is my second Battery Tender Jr for my second bike. The float feature is great, because it keeps the battery ready to go, and lets me ride on the infrequently warm winter days here in Colorado. Great value for a reliable product!
December 28, 2016
1 month ago
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
Bang For The Buck
4 / 5
does what it's supposed to do.
Keeps batteries alive longer. Definitely cheaper than replacement battery.
May 25, 2015
2013 Suzuki GSX-R1000
Great product so far
Just received the battery tender and installed. Its been on my bike for a couple of weeks now and seems to be doing its job just fine. I like the compact size of it.
November 18, 2013
2009 Yamaha FZ6R
Bang For The Buck
4 / 5
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
1 year ago
Bang For The Buck
5 / 5
Everyone should own one!
Had this on my battery all winter, and it kept the battery perfectly charged. Bike started right up in the spring!
May 12, 2014
2001 Suzuki GS500
Bang For The Buck
5 / 5
Just plug in and ... Nothing, cause it does it all by itself. No worries.
November 6, 2014
2007 Suzuki SV650
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
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Browse 22 questions Browse 22 questions and 89 answers
Why did you choose this?
RevZilla Store
Revzilla has good reputation and my 1978 Triumph Bonnie needs help at times.
Steve A on Jan 14, 2017
priced right and a must for the winter.
James H on Dec 25, 2016
Revzilla has good reputation and my 1978 Triumph Bonnie needs help at times.
Steve A on Jan 14, 2017
Nightster won't start in the cold!
Jonathan P on Jan 9, 2017
priced right and a must for the winter.
James H on Dec 25, 2016
Must have for a new bike
Richard M on Dec 12, 2016
after all the reviews and forum surfing, it seems this is the best option for a bike. the plus has its benefits, but as i am not needing to charge up a battery its unneeded for a bike.
Kyle d on Dec 6, 2016
excellent product
Alberto C on Dec 4, 2016
I have used these for the past several years. Simple and effective.
David V on Nov 27, 2016
This is a gift for my son. He requested it for the holidays.
Kathleen G on Nov 25, 2016
to charge in garage in cold and for extending battery life
Parasuram K on Nov 21, 2016
Because it works great
Bruce H on Nov 16, 2016
Battery maintenance for the summer bike while the winter bike becomes the new daily rider.
Thomas S on Nov 14, 2016
keeps me from constant monitoring the battery in the winter
Richard W on Nov 7, 2016
I'm moving to Cleveland in December (need I say more?)
Russell F on Nov 5, 2016
I chose this product because of the good reviews and company reputation.
Kosal D on Oct 31, 2016
Co-Worker owns it and suggests it
David W on Oct 16, 2016
on sale and nice to know battery is taken care of smartly
Scott P on Oct 11, 2016
Been using them for years.
William L on Oct 6, 2016
recommended by a friend
" " on Sep 26, 2016
My brother-in-law told me this is a must for any new motorcycle I listened!
Anthony R on Sep 9, 2016
Based upon the reviews
keith c on Sep 4, 2016
Gets the job done while small and compact.
Lewis S on Aug 18, 2016
I have used this product in the past when I stored my motorcycle for a year. I was very pleased that the motorcycle started right up a year later!
Mirna N on Aug 10, 2016
Quality brand, price and fast shipping.
Jeff A on Jul 27, 2016
Gotta keep the battery charged up during winter storage.
J O on May 5, 2016
everybody needs one if you are storing for a season
Jay L on Mar 28, 2016
for the kid
John M on Mar 17, 2016
Works like you expect it to, plug it in and forget it.
Matthew K on Mar 15, 2016
want to make sure my bike always has a full charge
anthony l on Mar 8, 2016
Recommended by Adam Revzilla Team!
kevin s on Mar 8, 2016
I needed another battery tender and this looked good and was on sale. Seems to work well.
Danny P on Feb 19, 2016
I have always use these tenders and now I have another motorcycle, Super Tenere, and I need one.
Ernie L on Feb 9, 2016
They work.
Charles Y on Jan 27, 2016
What can I say the junior is on all my bikes. Proven reliable
peter on Jan 25, 2016
Looking at the reviews it seemed to fit my need.
Backs69 on Jan 18, 2016
Value and features.
TNKTM on Jan 12, 2016
for winter storage
Alex V on Jan 6, 2016
Have no negative reviews from the people that I know hat that has them.
Charles R on Jan 2, 2016
Good review online
thomas b on Dec 29, 2015
Company reputation
Keith H on Dec 28, 2015
Battery Tender Juniors are recommended on the forums I lurk on and the price really can't be beat.
UltimateBrawler on Dec 20, 2015
after reading that once your battery goes down it might not come back up i decided this was a must have item for the winter time.
robert f on Dec 16, 2015
trusted name and good price at worry free charging
Tommy H on Dec 15, 2015
Keep battery charged during off season
Shelley H on Dec 13, 2015
i have a battery on everything and never have to replace batteries
Craig L on Nov 13, 2015
just moved from Florida and needed this for the winters here in Tahoe
SoFloFicken on Nov 12, 2015
History with the Battery Tender product and reviews.
Michael H on Nov 9, 2015
Checked on-line and had good reviews. Had rewards didn't cost me anything except shipping
James H on Aug 17, 2015
to keep my bike charged
Joseph T on Aug 5, 2015
Christopher A on Jun 5, 2015
I like that it is both a charger AND a battery tender once your battery gets to full charge.
Carmine C on May 29, 2015
Nightster won't start in the cold!
Jonathan P on Jan 9, 2017
Must have for a new bike
Richard M on Dec 12, 2016
what is the difference between "Battery Tender Junior" and "Battery Tender Junior HE" ?
Muhammad A on Nov 13, 2015
BEST ANSWER: The HE is high efficiency and is replacing the JR in the California market. I imagine the HE will eventually replace all the older models. The 12V HE is twice the price of the Jr, but the charge method and rate are the same, as is the float feature... so I bought a second Jr because the only difference I can see is the HE draws a little less power over longer periods because it is more efficient.
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
A shopper on Jul 10, 2011
BEST ANSWER: 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.
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
Andre D on Oct 29, 2013

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!
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.
Dakota P on Oct 15, 2015
BEST ANSWER: 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.
Can you use a battery tender with a Shorai lithium battery??
A shopper on May 13, 2014
BEST ANSWER: 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!
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
A shopper on Feb 16, 2014
BEST ANSWER: 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!
Do I get the 6 volt or 12 volt for my 2013 Harley V-Rod Muscle?
A shopper on Dec 27, 2014
BEST ANSWER: I would imagine 12. I would check your manual or look at your battery.
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?
A S on Oct 25, 2014
BEST ANSWER: 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!!!
can I use the battery tender jr. on my bike and my deep cycle batt. or would it damage something? Chip
A shopper on Nov 3, 2014
BEST ANSWER: I am fairly certain that you would be fine. It will charge the deep cycle battery to max Vm and then shutoff until V
Hello, I'm just wondering if I should purchase the 12V or 6V? I have a 2013 ninja 650.
cody m on Oct 24, 2014
BEST ANSWER: your bike has a 12v electrical system as do all modern bikes.