Posted by pete 23 on November 23, 2014 at 18:56:43 from (74.33.82.156):
In Reply to: Dang! Battery question posted by Notjustair on November 23, 2014 at 11:39:01:
We used to sell Neilsen's rebuilt alternators at the John Deere shop. In their brochure they had a large printed notice that their alternators were NOT battery chargers. In other words, if you have dead batteries, don't depend on the alternator to recharge it for you. That burns up more alternators than any other single item. Let's say you have a normal sized 12 volt battery in your vehicle. It will be right near 70 ampere rated capacity. So, if dead it would theoreticly take 7 hours of a full 10 amp charge to bring it to full charge, or 1 amp for 70 hours or one hour at 70 amps. Now we all know that when pushing 70 amps into a battery the voltage will rise above the regulated voltage of a vehicle and thus the charge rate will be way less than 70 amps. So, it would take a good long trip to fully recharge that battery. Sure it will crank over and sound good. Same as a half full coffee pot will fully fill your cup . That does not mean it is full charge. Put it on a fast charge for a while if you want but finish it off with slow charge until voltage is at 14.5 neighborhood with a very small amount of current flowing into battery. If you can open the cells, they should all be bubbling just ever so slightly. If not, it is not fully charged. I buy very few batteries.
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