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Old 12-30-2018, 07:38 PM   #1
Mk3supraholic
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Battery problems need help

So recently I installed some led flush mount turn signals i went to start my bike the other day and it would not turn over. The bike had been sitting for a couple months but not out of the ordinary for me. I jumped it and let it charge up but it quickly lost voltage after i turned it off so i went and bought a charger / maintainer. Viking from harbor freight. It charged the battery up to 12.75 volts but it felt way to quick. Took like 2 minutes at 4 amps. So i un pluged it verified with a voltmeter that it was in fact at 12.75 volts.

Within 24 hrs it was dead again. Im not sure if the turn signals i installed are causing some crazy drain with the bike off or if the battery the bed.

Anyways I plugged the maintainer back in and it now is charging upt to 13.8volts. I un plugged it because i dont want to blow up the battery i verified with the volt meter that my bater in fact has 13.8 volts!! But within a few minutes it drains down to nearly a dead battery again.

Wtf is going on
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Old 12-30-2018, 07:42 PM   #2
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13.8v is charging voltage (up to 15v is safe)

After you unplug your battery from the charger it should slowly drop down to 12.99/13v for AGM type, lead acid can be sit as low as ~12.6v

Sounds like a dead battery to me but you can take it to AutoZone and they can load test it for you.

Also I'll note that AutoZone carries Deka motorsports batteries which are quite good, if it's dead and you're in a hurry and don't want to wait for the best deal, they are a good battery.

Last edited by thtanner; 12-30-2018 at 07:45 PM.
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Old 12-30-2018, 08:50 PM   #3
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I can't think the turn signals are at all related here. If the turn signals were creating a drain, due to a wiring problem, they'd also be lit.

You simply have a dead battery that co-incided with the installation of the lights.

Oh, and 13.8v is the correct charging voltage. You won't be blowing-up anything.
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Old 12-31-2018, 09:51 AM   #4
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Shouldnt the charger stop charging once it reaches a full charge of 12.8? Why is it maintaining a 13.8 volt charge?
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Old 12-31-2018, 02:01 PM   #5
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Quote:
Originally Posted by Mk3supraholic View Post
Shouldnt the charger stop charging once it reaches a full charge of 12.8? Why is it maintaining a 13.8 volt charge?
Lead acid batteries charge at 13.8, not 12.8. This applies to automobiles as well.
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Old 12-31-2018, 05:50 PM   #6
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Quote:
Originally Posted by Mk3supraholic View Post
Shouldnt the charger stop charging once it reaches a full charge of 12.8? Why is it maintaining a 13.8 volt charge?
Because it is a charger and tender. That is totally safe to maintain that voltage. When you ride the bike, it's at 13.8 -> 14.9v at all times.

Once unplugged from the charger the battery should naturally fall down to 13v.
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Old 01-01-2019, 01:22 AM   #7
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Got it thanks
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