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
4.7 / 5
4.3 / 5
Fit & Finish
4.3 / 5
Product Style RevZilla Item # Manufacturer Product # Availability
12 Volt 177707 021-0123/0210123 In Stock: Ships within 24 hours


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4.8 / 5.0
108 Reviews
5 Stars
4 Stars
3 Stars
2 Stars
1 Star
Bang For The Buck
4.8 / 5
4.8 / 5
4.8 / 5
Ease Of Install
4.9 / 5
Fit & Finish
4.8 / 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
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
6 months ago
Bang For The Buck
5 / 5
5 / 5
5 / 5
Fit & Finish
5 / 5
Works as it should!
Charged up my non-starting Harley over night and it started right up in the morning. My bike doesn't like sitting in the cold, and now I can get it to start right up for my occasional winter rides.
January 26, 2017
5 months ago
Bang For The Buck
5 / 5
5 / 5
5 / 5
Fit & Finish
5 / 5
Easy install, great product
With three bikes sitting in the garage during winter it's a welcome accessory. I don't have to remove seats or lift gas tanks anymore with the quick connect giving easy access to charge the battery. Another happy customer.
December 16, 2016
7 months ago
Battery Tender Junior
I have a harley battery tender which is a heavier unit and makes this one seem cheaper, but this unit works works just as well and does a good job.
May 10, 2016
2016 Harley Davidson Electra Glide Ultra Limited FLHTK
Bang For The Buck
5 / 5
Exceeded all expectations! 100% recommend!!
I think all the positive reviews and 100% recommended rating says all you need to know. This thing works great and it is very well made. Took me less than 15 minutes to install and the wires and cords appear to be high quality. I mounted the pigtail such that the connector is exposed behind the removable right panel of my Honda VTX motorcycle. Since I must remove my seat to access the battery (requires removal of 3 bolts - huge pain), having quick access to a charging port under the right panel is so convenient. The pigtail also has a rubber cap to prevent moisture and corrosion. Highly recommend. I think its the best one on the market!
July 24, 2016
2012 Honda VT1300CX Fury
Bang For The Buck
5 / 5
4 / 5
4 / 5
Fit & Finish
4 / 5
Works great
Easy to set up and conceal cable. Works great. So far the trickle charger has shut off within a couple minutes so battery seems well charged.
January 8, 2017
10 months ago
Bang For The Buck
5 / 5
4 / 5
5 / 5
Fit & Finish
5 / 5
Battery tender junior
Great little product, buy this little battery tender.
January 1, 2017
6 months ago
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
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
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Browse 25 questions Browse 25 questions and 95 answers
Why did you choose this?
RevZilla Store
Small, easy to use.
L A on Jun 15, 2017
Handy little charger, been working great for over a year now.
smbrisen on Jun 3, 2017
Small, easy to use.
L A on Jun 15, 2017
Good price and reviews
John R on Jun 9, 2017
Handy little charger, been working great for over a year now.
smbrisen on Jun 3, 2017
Keeping my baby perky so she's ready at any time.
Matt F on Jun 1, 2017
To keep my battery recharged during the winter or time I have my bike in the garage.
Jofferson G on May 31, 2017
Very good for around NY winters
Tom P on May 31, 2017
Every time the bike gets parked at home, it goes on the tender.
John H on May 19, 2017
It's a good idea to keep your battery charged, especially through winter hibernation.
Tiffers on May 13, 2017
Plug it in and forget it. Keeps your battery fresh.
scott s on May 11, 2017
Basic and does the job.
Nicholas R on May 3, 2017
With four bikes, I cannot ride each enough to keep the batteries fresh.
Scott S on Apr 30, 2017
More of same for my second bike
A C on Apr 27, 2017
price & compatability
Will15Ultra on Apr 13, 2017
needed an extra charger, we have 3 bikes and all three are plugged in to charge over the off-season
Lenke L on Apr 12, 2017
Needed a tender only have one bike so I didn't need or want one of the bigger versions
Benjamin H on Apr 9, 2017
Perfect for a small bike or small area. This unit kept my CB300F juiced up all winter long. Fired up in March no problem. Great price, great item.
Ryan M on Apr 6, 2017
everybody could use a battery tender, especially if you have to store a bike over the winter in chicago
Dennis M on Mar 24, 2017
Good price, portable.. got have solid charge to ensure the commute gets made every day.
Steve P on Mar 17, 2017
Just bought a 2010 Road King Classic and now starting to shop for parts and accessories for my hog. My friend has one and I decided to get one also. works Great !
Tony M on Mar 10, 2017
Was a good match for our 2015 Ninja 1000's.
Brian H on Feb 25, 2017
Solid reliable product
Anthony A on Feb 18, 2017
Good for battery maintenance/ care.
Minh D on Feb 3, 2017
out of necessity and reputation of manufacturer
Vince B on Feb 3, 2017
The Battery Tender has more than paid for itself by saving my battery and allowing me to ride throughout the winter without having to worry about being able to start the bike on a cold morning.
Will W on Jan 28, 2017
keeps battery fully charged
Jeffrey I on Jan 22, 2017
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
Good price and reviews
John R on Jun 9, 2017
Keeping my baby perky so she's ready at any time.
Matt F on Jun 1, 2017
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!
Can this tender be used on ANY motorcycle?
A shopper on Feb 17, 2017
BEST ANSWER: Yes,I think so as long as u have the female output already out
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 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?
A shopper on Dec 5, 2014
BEST ANSWER: 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.