Battery Charging

SouthArk370Z · 10-23-2012, 10:15 PM

Quote:

Originally Posted by DEpointfive0

Fair enough, I think I started doing it too because my crank pulley is 20% underdriven and I have the stock alternator pulley. And sometimes while stopped at a light or something, you see the voltage dip from 14.2 to like 13, which is still good, but I just wanted to know if topping off the battery is bad in any way

If you want to be sure you are getting enough charge (if you do a lot of idling with an underdriven alternator, it's possible you are not), just put a voltmeter on the battery when you get home. A 100% charged lead-acid battery will read 12.6V and drops to 12.35V at 75% charge. Edit: Anything above 12.4 is usually called "charged".

DEpointfive0 · 10-23-2012, 11:35 PM

Quote:

Originally Posted by SouthArk370Z

If you want to be sure you are getting enough charge (if you do a lot of idling with an underdriven alternator, it's possible you are not), just put a voltmeter on the battery when you get home. A 100% charged lead-acid battery will read 12.6V and drops to 12.35V at 75% charge. Edit: Anything above 12.4 is usually called "charged".

Legit answer! Thanks for putting it quantifiably! Rep added
My battery is reading 12.99!
Looks like I won't be hooking it up anymore...

And not bad for an 2009 OEM battery that has spent most of its life in the heat of the South

Edit: Locking thread, thanks for the replies guys

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