[chbot] Have I killed my bot battery?

[Andrew Errington]

Here's a discussion on testing and evaluating SLA batteries:

http://www.fieldlines.com/story/2003/8/24/20535/6203

I have just bought a D3800 PSU from Dickies (on special at about $190 if 
you have a Trade Card).  I am now trying to charge my four SLA's as 
described in the article because I am sure one of them is dud, and the 
others aren't much better.

Anyway, I hope you can resurrect yours and get some more use out of it.  I 
have read that once they have been significantly discharged (less than 
10.5V) then they are sad and won't last much longer.

Andrew



On Wed, 07 Mar 2007 23:54, you wrote:
> Seems I was correct.
> I managed to kick start it by putting a couple of charged nicad's in
> serially to raise the voltage. The charger is slow enough to change
> state that i was able to connect the battery up before it shut down
> again.
>
> Probably an idiotic way of doing it but it now seems to be charging so
> I'm happy.
>
> Off to research low voltage cutout circuits so I don't get this again.
> C
>
> John Tiler wrote:
> > perhaps. If its a 12V sla try a car battery charger on it, if you
> > do.... Pump it up a bit and then try using ur charger.
> >
> >> From: Carl Ranson <carl.ranson@paradise.net.nz>
> >> Reply-To: chchrobotics@lists.linuxnut.co.nz
> >> To: chbot <chchrobotics@lists.linuxnut.co.nz>
> >> Subject: [chbot] Have I killed my bot battery?
> >> Date: Wed, 07 Mar 2007 21:35:21 +1300
> >>
> >> So I left my bot's electronics running on the bench overnight and my
> >> battery is down to 7 volts (its a 12v SLA)
> >>
> >> I've just put it on the charger and nothing happened.
> >>
> >> The charger I have is a jaycar one (http://tinyurl.com/ytlhkx) and I
> >> note that many of the chargers on their website have a note "These
> >> chargers will not charge a totally flat battery".
> >>
> >> Is it possible that 7v is low enough to make the battery
> >> non-detectable to the charger? Is there any way to trick the charger
> >> into detecting it?
> >>
> >> thanks team.
> >> C
> >>
> >>
> >>
> >>
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