Battery Charger/Eliminator

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From: KE3FL@delphi.com
Date: Sat Apr 27 1996 - 20:30:19 EDT


From: adams@chuck.dallas.sgi.com (chuck adams)
Subject: [7611] Gel/Cell Charger Alert

Gang,

Last Saturday I was at work and on the way home stopped at Altex here
in Dallas.

They had a charger for $12.95, so in the spirit of trying anything
once, I thought what the hey>

Here is what the package says:

EMCO PS-612

6/12 Volt DC Batter Charger/Eliminator

Ideal for charging ni-cad, gel cell or lead acid batteries

Input: 117 VAC 60Hz

Output: 6V/12VDC 750mA

Regulated with 30" connecting cable with alligator clip

Emco Division
Components Specialities Inc.
Lindenhurst, NY 11757

Cost $12.95 from Altex

Well, last night I measured about 12.1V on the 20AHr Gates cells, so I
thought it'd be a good test on these puppies.

Inadvertantly I left the R/S digital multimeter on over night. So this
morning as I passed by the desk I saw that it was on and display was
active so I went over to shut it off. Imagine my surprise when I saw a
reading of 15.75V DC!!!

No need to tell you that I immediately unplugged the charger. Don't
know what I'll do, either take it back for refund or put a resistor in
series to reduce the effect. I surely do not want to have gel/cells
subjected to over voltage for any period of time.

Cells are back to 12.83V with GM-30 online, so no damage done, but I
hate to think what would have happened if I had not attended to them
for a day or so. :-( Bummer.

FYI

Chuck & gang:
recap from Chuck:
[[ EMCO PS-612

6/12 Volt DC Batter Charger/Eliminator

Ideal for charging ni-cad, gel cell or lead acid batteries

Input: 117 VAC 60Hz

Output: 6V/12VDC 750mA

Regulated with 30" connecting cable with alligator clip

Emco Division
Components Specialities Inc.
Lindenhurst, NY 11757

Cost $12.95 from Altex ]]

The type of "charger" you picked up looks to me to be the standard
voltage/current battery eliminator. It can be used as a charger but
one does need to check it from time to time. These elimiators do NOT
have circuitry in them to either limit voltage or current, so, if your
battery is very low, say 9 volts, the charger will pump out as much
current as it can (more than the 300 ma given at 12.1 volts) and when
the battery is fully charged (since there is no circuit to check for
this condition) it puts out a smaller current at a higher voltage.

Basic design: transformer, doides, filter, and that's all.

Good-luck Chuck. I use this type of "charger" all the time, I use a
small lamp in parralle and if picked just right it will draw the excess
current off when the battery is fully charged.

Phil/KE3FL
:-)


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