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(ET) Re: testing batteries
To *really* test the batteries would take a lot of time that you can't
do in the field. However, assuming you have a pile to choose from for
cheap:
You could first open the caps and look inside. No water, lots of gross
stuff growing on the plates, etc. would be cause to move on. Also make
sure the terminals and case don't look abused, dropped, etc. Then can
use your load tester... should be over 6 volts no load, and over 5 volts
with load. Any battery that drops under 4 volts has a reversed cell so
leave it and move on.
This will get you a bunch of cheap batteries that at least have some
life in them. You won't know how much capacity they have until you
either do detailed load testing (ie keep a load on them until
discharged, recharge, and repeat several times). Putting them in the
tractor is probably the easiest way to test. I'd be tempted to buy say 9
potentially decent ones so as to have a few backups. If you have an
external charger, it would be a good idea to charge the batteries
individually before trying in the tractor (or at least in pairs if you
have a 12-volt automotive charger handy).
Mike Wallace wrote:
Okay guys, I got one for you to discuss. I've got a lead on some
supposedly "decent" used golf cart batteries for $6 a piece from a local
golf course. $6 is the current core charge that the Interstate dealer is
charging the guy that's selling the new batteries to the guy at the golf
course.
What's the best way to try and field test them before I go to the
trouble of buying them and bringing them home. Currently in my area, no
recycling businesses are buying old batteries.
Is the standard automotive load tester worth using on our batteries? I
recently acquired a "defective" one that just needed a new lead on one
side; and naturally I've got a hydrometer and volt meter.
Any suggestions? Especially on just how to use the load tester, if it's
feasible to even try to use it.
Mike in KY
_________
Jim Coate
1970's Elec-Trak
1998 Chevy S-10 BEV
1997 Chevy S-10 NGV
http://www.eeevee.com