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Old 02-19-2010, 08:42 PM
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12 volt 3 amp battery charging

is 3 amps- at 12 VDC- enough to even attempt to charge a normal sized car battery? 550 or 650 CCA

what kind of time frame would it take to charge up a battery around 2/3 of the way charged up?

how do you figure charging rates/times?

i have a specific gravity tester but i have no idea how to read it, it has colored balls in it

no idea what they are for, or how to read it.

i need a crash course in this stuff

a quote i read on a page just now:
There is no relationship between Cold Cranking rating [CCA] and charge time. Two batteries may have the same CCA rating, but very different RC ratings. ALWAYS use RC or AH ratings to determine charge time. If you do not know the rating for your battery, ask your battery dealer.

as you can tell i dont know jack about charging times and rates and whatever..

i was reading this info page just now and wow i cant believe how easy it is for a battery to sulfate.... im surprised any battery even lasts a few months at all.,,. let alone a few years.. wow.. they need to come out with a better type of battery than lead acid ones wow..... crazy..... it sounds like if you even just look at them the wrong way they will sulfate... sheesh...

thanks for anything! =)


Last edited by fast68; 02-20-2010 at 01:46 AM.
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Old 02-20-2010, 05:33 AM
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3 amps should charge the battery (if it's still any good) in 12 hrs.
A used battery shop in town drains old lead type battery's and replaces the acid with new. After 12 hrs. on a 3 amp trickle, if it doesn't fully charge, they junk them for recycle.
At the price of new battery's now a day's, his business is booming.
The tester you mention is used to check the strength of the acid in the battery sort of like a coolant tester for your radiator. If the acid level is weak, new acid can be put in and with a good charging system can be run again extending the life of the battery for a while longer.
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Old 02-20-2010, 06:45 PM
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If the battery is not dead flat it should be ok. Sometimes when they are real dead they need a strong current to get them to take a charge.
Never add acid to a battery, the acid never really weakens as only the water boils away. The reason places that rejuvenate battery's replace the acid is to get rid of impurities or additives that may have been used.
Usually with hydrometers, the more balls that float, the stronger the charge is. Temperature has a huge effect on specific gravity.
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Old 02-25-2010, 11:08 AM
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interesting stuff hmmm thanks much!!
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