Posted by David, Surrey UK on October 02, 2007 at 03:32:00 from (84.9.91.28):
In Reply to: charging A 6V Battery posted by Glenn FitzGerald on October 01, 2007 at 10:49:23:
bill mar said: if he had two 6 volts coulndt he charge both using the 12?
Yes, in theory, if they're both identical batteries in the same state of charge. Which in practice they won't be. It wouldn't harm the charger but it might harm the batteries.
If one of the batteries is completely flat and the other is completely full (to take the worst case) then the full one will be overcharged while the flat one gradually charges up.
A lot of books will tell you that the two batteries will eventually equalise in charge if you leave them on float charge in series. But a colleague of mine did some experiments with lead-acid batteries (in the context of electric vehicles) and found that this balancing effect doesn't happen, even though it should. He had to devise some clever charge-transfer circuits to equalise the charges between batteries. He's a full professor of electrical engineering at a highly respected US university, so I trust his findings.
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