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Re: Re: Batteries
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Posted by Robert on December 28, 2003 at 13:26:46 from (208.23.178.171):
In Reply to: Re: Batteries posted by Jeff on December 28, 2003 at 12:38:17:
Well, really, I didn`t leave anything out, but, I may not have made myself clear. The internal resistance of the cell is not a factor until there is current flow. If you take two identical, new batteries, charge them identically, cycle them identically, charge them identically again, and so on, let them rest and later check their voltages, there WILL be a slight difference. Maybe only a few thousandths of a volt, but, enough that if they were connected together, there will always be current flow between them. Left tied together in parallel, (with no applied load) over time, one cell will become overcharged and the other depleted. It's a fact. Due to impurities, no two batteries will have the same (at rest) voltages when fully charged. Ham radio operators have known this for years, many of them have backup batteries to stay (on the air) when power goes out. Many of them are hyper about monitoring their batteries. All of them find that sooner or later when they need battery power, they will be unhappy because one battery will have "fought" the other.
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