Posted by pete 23 on April 12, 2018 at 20:24:56 from (50.33.13.123):
In Reply to: Charging battery posted by 37chief on April 12, 2018 at 18:13:38:
Well, you have plenty of answers to choose from. I might as well add some more. Your battery will be at least a 70 ampere hour battery. Not 70 amp, but ampere hour. Theory wise, that would mean it would take 70 hours at one amp charge to recharge if it was totally dead. Of course a battery is never l00 percent efficient so it actually takes longer.
Throwing a quick charge will get it up to where you can use it but that does not mean it is full charge by any means. Something like putting a pint of water into a five gallon pail. That would give you enough for a cup of coffee but it won't fill a couple of pots. Now, leaving that pail partially full won't hurt the pail , but the battery in that stage will suffer because the inactive parts of the plates will harden, sulfate, and then are useless.
If dead and you jump start vehicle, the alternator will throw a heavy charge in for a while but pushing a heavy charge in takes higher voltage than slow charge so it soon tapers off to a low charge rate. It never quits charging though. It is always pushing in a small charge of up to two or three amps. So, if you are driving across country, 24 hours straight, that battery is always getting a small charge. Does it harm the battery. Only if charging voltage is too high which will push more than an acceptable couple amps of charge.
So, put a slow charger on and leave it on until the voltage reaches normal charging voltage of right close to 14.5 volts. Automatic charges normally quit charging before full charge is reached. If you can open the cell caps and look in, every cell should and needs to be bubbling just slightly at a low rate of charge near that 14.5 volts.
Now, you are really confused and I don't blame you. BUT, TOO darn many batteries are ruined by not bringing them up to a full charge condition while doing it at a low, slow proper voltage rate.
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