|Model||Battery Tender Jr. Battery Charger|
|Item Weight||1.8 pounds|
|Product Dimensions||8 x 4 x 9 inches|
|California residents||Click here for Proposition 65 warning|
|Item model number||021-0123|
|Manufacturer Part Number||210123|
|OEM Part Number||021-0123|
|ABPA Partslink Number||13|
|Vehicle Service Type||off-road-motorcycles, all-terrain-vehicles|
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Battery Tender 021-0123 Battery Tender Junior 12V, 0.75A Battery Charger will charge and maintain your battery so that it is ready to go when you are! It's lightweight, fully automatic and easy to use
|Price:||$25.93 & FREE Shipping. Details|
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- Spark proof during lead connection, reverse polarity protected and includes a 12-foot output cord and 5-year warranty
- 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
- Solid state two color LED indicates stage of charger.
- If the battery voltage drops too far under load, full charger output power resumes
- Spark proof, Reverse polarity protected, 12' output cord
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This item Battery Tender 021-0123 Battery Tender Junior 12V, 0.75A Battery Charger will charge and maintain your battery so that it is ready to go when you are! It's lightweight, fully automatic and easy to use
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|Item Dimensions||4 x 8 x 9 in||4 x 11 x 11 in||3 x 5 x 9.75 in||4.75 x 9 x 11 in||7.5 x 7 x 11 in||5.3 x 9.1 x 3.5 in|
Battery Tender Junior 12V Battery Charger is much more than a trickle charger. It has a brain, is lightweight, compact, fully automatic and very easy to use especially in small spaces. This battery charger will keep the battery fully charged so that it is ready to go always. It has a microprocessor controlled fully automatic charger and maintainer and is designed to extend the life of any lead acid battery commonly used in automobiles, motorcycles, ATVs, personal watercraft, RVs, boats, airplanes, golf carts, back-up generator systems, etc. Any vehicle or battery-operated piece of equipment not used on a daily or regular basis is a candidate for a Battery Tender charger. The advanced technology will bring the battery back to a full charge without overcharging and then float or maintain the battery for an indefinite period of time. The Battery Tender Junior comes equipped with alligator clips and ring terminals for easy hook up. An optional 25 feet extension cord (part number 081-0148-25) is sold separately.
From the manufacturer
Battery Tender Junior Benefits and Features
Our onboard computer assures correct level of power is sent to the battery at all times.
ISM Adaptive Charging
ISM (Infinite Sequential Monitoring) adapts to the battery’s needs hundreds of times per second.
Reversed Hook-Up Protection
Battery Tender checks for a correct connection before giving power.
Battery Tender checks for a correct connection before giving power.
Quick Disconnect Harness
Connect and disconnect Battery Tender Junior in seconds.
Connect and Forget It
Once connected, the Battery Tender manages your battery’s health on it’s own.
Ideal for Motorcycles, ATVs, Scooters, and Automobiles.
- Input Voltage: 120VAC / 60Hz.
- Output Voltage: 12 Volts DC @ .750 MA.
- Shipping Weight: 2 Lbs.
- Agency Approvals: UL/CSA.
- P/N# 021-0123.
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Top Customer Reviews
But let's first get back to basics: what is a float charger, and why is it needed?
Lead-acid batteries, of the type used in cars and motorcycles, lose a part of their charge over time just sitting when they aren't even connected to something. When left in a bike that has a clock or radio memory circuit in it that constantly draws power even when the bike is off, that loss of charge is even faster.
Lead-acid batteries "like" to remain at full charge at all times. A battery that is kept at full charge will have a much longer service life than a battery that is left sitting with less than a full charge.
I used to go through a lot of batteries - my motorcycle batteries would last between one and two years before they needed replacement. With multiple motorcycles (not to mention other battery powered things like a generator, snow blower, etc.) this gets expensive!
I figured I would put a trickle (float) charger on my main GL1100 battery to help keep it fully charged. I bought a cheap trickle charger from Harbor Freight, for under $10. I hooked it up to the battery and left it sitting overnight. The next day, to my utter surprise, the battery was dead! The cheap trickle charger, with no intelligence in it and no way of turning off when the battery was charged, overcharged the battery, destroying it! I could charge it fully, but its plates were sulfated, and it would no longer produce enough current to start the bike. This was an expensive lesson - and taught me about the false economy of Harbor Freight float chargers!
So it was with a bit of trepidation that I tried the Battery Tender Jr. - I didn't really want to throw another $100 down the drain for another new battery. The difference with the Battery Tender products is that they are intelligent: they have computers inside that analyze the state of charge of the battery to which they are connected, and alter their output to adjust: Initialization, Bulk Charge Mode, Absorption Mode, Float Mode).
The result: I'm still using that battery five years later, and it still works like it is brand new. I was so impressed that I bought more: I now own five Battery Tender Jr.'s, and they are connected to all of my bikes and devices, 24/7. Every time I park my bike, I plug it in. I have not had a single battery go bad in the five years since I have started using Battery Tenders - and every battery still performs like it is brand new.
The Battery Tender Jr. comes with a 12 foot cord and a plug. This plug then attaches to one of two included connectors: a set of alligator clips, for temporary attachment to a battery, or a set of ring terminals, for permanent attachment. I use the ring terminals, then feed the other end of the connector up through the bike somewhere where it can be hidden. In my wife's PC800, the connector hides behind the right passenger footpeg. In my GL1500, it hides in the left passenger cubby. When I park the bike, I simply flip open the cubby, plug in the Battery Tender, and I know the battery is protected and maintained.
The Battery Tender is designed to be pretty much indestructible. You can hook it up backwards to the battery, and nothing will happen. You can start the bike with it connected, no problem, it simply turns itself off. It's spark proof, and has an indicator light that flashes and changes color to tell you the state of your battery, and what it is doing to manage it. It has a five year warranty, which I have not had to use.
The Battery Tender works great on standard flooded wet-cell lead-acid batteries, as well as AGM (absorption glass mat) batteries. If you have a gel-cell battery, there is a different version that has programming to work properly with them.
And you can now get accessories that plug into the Battery Tender vehicle-side connector when the Battery Tender is not connected. These provide USB charging outputs and 12 volt cigarette lighter-style power ports to allow you to plug your electronic devices into your vehicle. See more about these accessories here: Battery Tender USB Charger and 12 volt Socket
Overall, this is one of my favorite products, they work amazingly well, keep your batteries in top shape, and cost less than a quarter of the cost of a single new battery. I can't recommend them highly enough.
For the electrically minded:
It's just a rectified waveform stepped down with a transformer and fed to your battery. The current limiting of this device is done with pseudo-pulse width modulation, I suspect a schmitt trigger watching the relaxation voltage of the battery. The attached images show it charging a gel cell battery, one is during normal charge and one is toward the end of charge and it's limiting the average current flow by turning on and off quickly.
For the normal folk:
It's a fairly cheap, brute force way of charging a battery and no different than how the cheap $6 Chinese battery tenders work. You just get a fancy blinky LED and a few extra ways of connecting it to your battery. Perhaps the quality is a little better?
Edit: For those considering this product... It is not a battery charger. It is for maintaining fully charged batteries. There are some negative reviews from folks that did not realize what they were buying.