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Message started by rl153 on 09/07/16 at 16:21:11

Title: Battery tender jr
Post by rl153 on 09/07/16 at 16:21:11

Im charging a car battery with a battery tender jr. It's reading 13.14 volts and is still solid red .At what voltage should it start blinking green? Anyone know?

Title: Re: Battery tender jr
Post by verslagen1 on 09/07/16 at 17:49:02

A BT jr is wholly under powered for charging a car battery and they are not made to charge a m/c bat from a low state of charge.

Title: Re: Battery tender jr
Post by Kris01 on 09/07/16 at 18:09:46

I have one but only use it as a tender to "top off" the battery if it has sat for a while. I usually only use it in the winter because batteries seem to drain faster in the cold while sitting. I wouldn't try to charge a battery with it.

Anyone know the amp output of one of these?

Title: Re: Battery tender jr
Post by Oldfeller on 09/07/16 at 18:18:05

By design a tender is intended to be hooked up to a fully charged battery to maintain it at a precise minimal level to keep it alive and healthy during STORAGE.

You must charge up the battery before putting it on a maintainer in the fall.

You generally have to recharge the battery fully after a winter sitting on the maintainer, since the charge level maintained is a maximum healthy, MINIMUM CHARGE LEVEL. You only get a few seconds of crank time at minimum healthy before you drop BELOW the magic 10.x volts that will no longer fire our black box driven spark plug.

Drill is, charge it up fully before putting it to sleep on the maintainer.

Charge it up fully before cranking up the bike for the first time in the spring.

I find that a maintainer, properly used, can take a 2-3 year battery and make it a 4-6 year battery (or sometimes better).

Title: Re: Battery tender jr
Post by justin_o_guy2 on 09/07/16 at 18:22:41

Im charging a car battery with a battery

Nooo,
You're Trying to charge a car battery..

Title: Re: Battery tender jr
Post by Oldfeller on 09/07/16 at 18:29:12

Title: Re: Battery tender jr
Post by Ruttly on 09/07/16 at 19:33:21

Here in California's Central Valley we don't store our bikes for the winter ,

WE RIDE THEM !

Title: Re: Battery tender jr
Post by rl153 on 09/07/16 at 19:35:34

The battery is fully charged. 13.18 volts. when should the light turn green? How much higher does it have to go thanks!

Title: Re: Battery tender jr
Post by Oldfeller on 09/08/16 at 04:29:07

Voltage is one thing. It is like water pressure.

Amperage is like the flow rate of water at any given pressure.

A squirt gun has lots of water pressure, but no amperage (or flow rate) behind it.

A fire hose has both ..... (knock you over and roll you right along, it will)

You are telling us your bathtub is acting empty but your squirt gun seems to be working well --- but you can't seem to get your tub filled up all the way full for very much. ::)

A normal motorcycle battery charger is a 1-2 amp charger (a garden hose flow) which will fill your battery up in about 8-14 hours from totally empty. A properly charged battery (fully charged) yields a lasting, stable voltage of at least 12.54 volts which hangs in there after a shot or two of cranking load.

Check the output on your trickle charger. Sure, it operates at full voltage alright, but I bet it has an output that is measured in milliamps, not amps.

Title: Re: Battery tender jr
Post by rl153 on 09/08/16 at 10:23:42

The battery is working ok , its just the battery tender that wont turn green , . Its probably a slightly burned out battery tender. I called deltran , they told me the green light doesn't come on till 14.1 volts and it could take 80 hours to get there . I guess that answers my question.

Title: Re: Battery tender jr
Post by Kris01 on 09/08/16 at 19:04:11

If you can get the bike to crank, the ignition system will charge a lot faster than a tender. ;)

Title: Re: Battery tender jr
Post by justin_o_guy2 on 09/08/16 at 19:08:44

You're trying to fill up the bathtub through a straw.
Get a charger o haul it in for a test. They HAFTA charge it to test it.
DON'T let them Quick Charge it.

Title: Re: Battery tender jr
Post by Kris01 on 09/08/16 at 19:10:58

You can also jump start the bike with a NON-RUNNING car. That'll charge it pretty quick.

Title: Re: Battery tender jr
Post by justin_o_guy2 on 09/08/16 at 19:15:08

Yep, ditch my post, there is a much better answer.

Title: Re: Battery tender jr
Post by rl153 on 09/09/16 at 16:38:03

I appreciate your answers , the mistake we made was using the deltran jr to bring the charge up on the battery instead of a regular charger like you say JOG. Now I think the JR is somewhat malfunctioning . but the battery passed a load test and works fine.Thanks!