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Posted by Stubby on October 2, 2006, 1:25 pm
I bought a 9.6v Ryobi from Home Depot but hardly use it. The battery
does not seem to charge because it lasts only a minute or so now. The
yellow light on the charger has never come on, just the red "charging"
light. How can I tell if the battery is bad or the charger? TIA.
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Posted by Joseph Meehan on October 2, 2006, 1:33 pm
Stubby wrote:
show/hide quoted text
> I bought a 9.6v Ryobi from Home Depot but hardly use it. The battery
> does not seem to charge because it lasts only a minute or so now. The
> yellow light on the charger has never come on, just the red
> "charging" light. How can I tell if the battery is bad or the
> charger? TIA.
Chances are it is the battery. They don't like to set around unused for
a long time.
I suggest buying a new battery and trying it out. You likely need one
and if it turns out that it was the charger, you can get one of those and
you will have a spare battery. That is better than a spare charger.
--
Joseph Meehan
Dia duit
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Posted by Nick Hull on October 3, 2006, 8:46 am
show/hide quoted text
> Stubby wrote:
> > I bought a 9.6v Ryobi from Home Depot but hardly use it. The battery
> > does not seem to charge because it lasts only a minute or so now. The
> > yellow light on the charger has never come on, just the red
> > "charging" light. How can I tell if the battery is bad or the
> > charger? TIA.
>
> Chances are it is the battery. They don't like to set around unused for
> a long time.
>
> I suggest buying a new battery and trying it out. You likely need one
> and if it turns out that it was the charger, you can get one of those and
> you will have a spare battery. That is better than a spare charger.
One trick that often works is to zap the 9.6 v battery with a 12 volt
car battery for 5-10 seconds. The sudden rush of current will melt the
crystal dendrills that form thru the electrolite and discharge some
cells. After the zap, if you have full voltage on the battery (check
with a voltmeter!) then the battery will charge normally on the charger
and work in use. The fix won't last forever, you'll probably have to
zap it every time you want to charge it because the crystals punched a
hole in the separator that will allow the crystals to regrow. If your
use is infrequent you can live with it for years.
--
Free men own guns - www.geocities/CapitolHill/5357/
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Posted by m Ransley on October 3, 2006, 9:11 am
I was wrong each cell would be 1.35v, , its 8 cell and full charge is
10.8v. 9.6 is actualy discharged
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Posted by Rich256 on October 3, 2006, 1:33 pm
m Ransley wrote:
show/hide quoted text
> I was wrong each cell would be 1.35v, , its 8 cell and full charge is
> 10.8v. 9.6 is actualy discharged
>
Yeah, you need a pretty good meter to determine state of charge.
However, a sudden drop to below 9.6 is a pretty certain indication of a
shorted cell.
This guy has a pretty good graph of voltage as the cell discharges.
Much of the time it will be reading about 1.2 volts but once it hits the
"knee" it drops fast. Discharge to that point should be avoided because
it can result in reverse current through any weak cells.
http://www.uoguelph.ca/~antoon/hobby/techbat.htm
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> does not seem to charge because it lasts only a minute or so now. The
> yellow light on the charger has never come on, just the red
> "charging" light. How can I tell if the battery is bad or the
> charger? TIA.