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Getting a dead battery to charge?

This is a discussion on Getting a dead battery to charge? within the General Help forums, part of the LSx Technical Help Section category; My bike battery is DONE... and my battery tender wont charge it (it acts as though there is no battery ...

  1. #1
    Senior Member predator's Avatar
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    Getting a dead battery to charge?

    My bike battery is DONE... and my battery tender wont charge it (it acts as though there is no battery connected... I think i have heard that you can hook another battery to the dead one and trick the charger to charge the dead one...

    Any one done it? Any tips or tricks?

    -me

  2. #2
    None Shall Pass Knight's Avatar
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    Have you checked the acid level in the battery? You could try replacing it, it may work. Obviously, be careful when doing so, as you are dealing with acid.
    Otherwise, you'll need to replace the battery. I wouldn't recommend trying to "trick" a charger into charging a battery.

    Oh, and make sure when charging that you have the charger hooked up correctly - the right polarity. I've caught myself hooking it up wrong.

  3. #3
    Senior Member predator's Avatar
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    its a sealed battery... and the charger is hard wired into the bike... there are no polarity issues...

    -me
    Last edited by predator; 03-05-2011 at 01:00 PM.

  4. #4
    None Shall Pass Knight's Avatar
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    Then I'd say you'll need to pony up the $ for a new battery.

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    Smiles for 9.5 Years cammed goat's Avatar
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    I agree. I have tried to charge stone-dead batteries for customers and they STILL had to buy a replacement. I think of it as a 50-50 shot. You could try to charge the old battery...but the odds are you will need a new one.

  6. #6
    Senior Member SteveCZ28's Avatar
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    some guys have to run jumpers to get a charger to charge a dry cell (optima) but in your case the battery is done for, and will need replaced. they arent priced too bad for the bikes

  7. #7
    Firebird Encyclopedia 9T8W66's Avatar
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    The run of the mill Home Battery chargers won't read or charge a battery that's below 10-10.5 volts. This is a safety feature so you don't hook up a 6 or 8 volt and blow them up.
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    That guy thearborbarber's Avatar
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    Hot magazine did an article last winter about this. They hooked up a 12v battery in parallel do the dead battery. Then the battery charger was hooked up to the pair. This revived batteries about 75% of the time.

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    Senior Member JayTA98's Avatar
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    be careful with this. If you are going to mess around with it wear googles. I will hate for the battery to blow up on ya. I seen it a few times. good luck.

  10. #10
    Electrical Engineer KMdef9's Avatar
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    What about the auto parts store as well? They might be able to get a charge on it.

    Have you tried leaving a trickle charger on it for 48hrs our so? Keep at room temp.

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    Senior Member predator's Avatar
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    I have it going right now... we will see how it works... I left the trickle charger on it for prolly a week and it just acted like there was no battery tied to it... I will let you know if it worked...

    -me

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    Firebird Encyclopedia 9T8W66's Avatar
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    Quote Originally Posted by predator View Post
    I have it going right now... we will see how it works... I left the trickle charger on it for prolly a week and it just acted like there was no battery tied to it... I will let you know if it worked...-me
    refer to my previous post

    The battery doesn't have enough voltage to be recognized.

  13. #13
    That guy thearborbarber's Avatar
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    Quote Originally Posted by 9T8W66 View Post
    refer to my previous post

    The battery doesn't have enough voltage to be recognized.
    That's why hotrod used the second battery in parallel. To give the charger 12v.

  14. #14
    Electrical Engineer KMdef9's Avatar
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    Quote Originally Posted by 9T8W66 View Post
    refer to my previous post

    The battery doesn't have enough voltage to be recognized.
    Mine do, but mine aren't "run of the mill" I guess.

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    Member parnelligq's Avatar
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    BUY a battery! I had one blow and its like a grenade. Not worth you getting hurt.

  16. #16
    Senior Member JayTA98's Avatar
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    Quote Originally Posted by parnelligq View Post
    BUY a battery! I had one blow and its like a grenade. Not worth you getting hurt.
    Thank you!!!

  17. #17
    Firebird Encyclopedia 9T8W66's Avatar
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    We use constant voltage industrial chargers that will do 10 batteries at a time linked in series. I've seen them bring back a battery from 2-3 volts. Also one reason a Battery explodes is because of lack of water/acid in the cells and it builds up pressure because the vents are closed up. It sounds like a shotgun going off.
    If it's a maintainable battery with caps you need to fill it before charging, if it's a sealed battery like and old Delco then it's done. I've seen old batteries read full voltage but have one dry or dead cell which causes them to not hold a load test.
    I loop batteries for charging everyday and linking two batteries in parallel to trick the charger isn't something we do with regular lead acid batteries. This is how Optima's are charged when their very low though.
    Last edited by 9T8W66; 03-06-2011 at 07:32 PM.

  18. #18
    None Shall Pass Knight's Avatar
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    Quote Originally Posted by predator View Post
    its a sealed battery... and the charger is hard wired into the bike... there are no polarity issues...

    -me
    As I said, it sounds like he needs to just get a new battery and be done with it.

  19. #19
    Veteran 0rion's Avatar
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    first off...how old is the battery? If it's fairly old just replace it. If it's newer you need to get an initial charge on the battery prior to charging. With my battery charger I'll set it on "start" mode for 10 minutes or so and then try to get it to charge....usually works unless the battery is just done.

    Side note: Several years ago when I was working at Coke I was putting a fresh battery into a forklift......36v battery that was roughly 3'long x 2.5'wide. Whoever had put the end on the battery left a little bit of exposed cable. When I sat it down in the forklift the cable shorted against the side of the lift causing it to arc and burn through the top of the lift for a few seconds and then it exploded with me about 2 feet from it. Took days for me to stop shaking and get all the shit cleaned out of my pants.

  20. #20
    Member dav-02ws6-m6's Avatar
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    i tried putting new acid, charged it and it still didn't work.

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