Re: [VAC] Battery Overcharging

["Dr. Gerald N. Johnson" <geraldj@xxxxxxxx>]

A diode does act like a one way valve, but with some voltage drop.
Enough voltage drop to keep a properly regulated small charger from
getting the battery to full charge. Many small chargers are not
adequately regulated and don't properly protect the battery. There are a
few that are designed to stay connected to the battery, those have the
diode built in but control the voltage accounting for the forward drop
of the diode.

I have a small 3 amp charger (had it for 25 or more years) that is
guaranteed to overcharge a battery given a long enough time. Its not
voltage regulated.

Take a look at the information about battery charging on
www.statpower.com to learn more about quality battery charging. 

In my experience, precision in controlling battery charging voltage can
lead to drastically extended battery life. Lack of precision can lead to
very early battery failure.

Gerald J.