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From: Aaron Pailthorp <aaronp@MI*.co*>
To: Tech Diver <techdiver@aquanaut.com>
Subject: Charging batteries
Date: Mon, 5 Jan 1998 11:46:58 -0800
I just got a used AUL light (Thanks Barry!) and I have some questions about
charging the batteries. I could just go get a cheap auto battery charger I
guess, but I already have a perfectly good 0 to 14V adjustable power supply
that can be limited on amperage as well.

What I want to do is set the power supply to a given voltage, and charge the
batteries. The power supply has a current (amp) meter as well as voltage,
and is infinitely (versus discrete) adjustable for volts, and infinitely
limitable (intermittent breaker) for amps. Can I get away with using this?
What is the desirable voltage to charge batteries? What should I expect in
current draw? How many amps should I put on the batteries? I realize that as
the batteries charge, the amps drawn should drop, will this allow me to
judge the level of charge?

So, if I have two 7 AH batteries in series for a total of 14 AH, what is a
good current (amps) to charge at? What voltage should I expect that to be
for fully discharged batteries? My power supply can sustain 20 amps, and
peak to 30 amps, so I'm sure I could cause something destructive to happen
if I'm not careful, what is an absolute limit in amps?

Thanks,
-->Aaron
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