Re: [NTLK] Battery Oddities...

From: Johannes Wolf (
Date: Thu Jun 27 2002 - 02:15:32 EDT

But first you should make sure that the batteries are almost empty before
you recharge them. Doing this cycling a few times was already reported to be
sufficient to get the capacity back.
But the freezer trick is worth a try I think.

Depending on what possibilities you have there are some other options:
charging with an external charger with constant current for a longer time
(e.g. C/10 for 10 hours)
shock load them with a large charging current for short time.


> -----Original Message-----
> From:
> []On Behalf Of John Goggan
> Sent: Wednesday, June 26, 2002 8:18 PM
> To:
> Subject: [NTLK] Battery Oddities...
> Sorry for bringing this back up -- I know others have asked and possibly
> answered, but I never quite "got it." I've got several batteries
> that all do
> the same thing... They seem to last only an hour or two -- and, when
> charging, they go from 20% to 100% within minutes (or even seconds
> sometimes). In other words, they obviously aren't really charging...
> I recently installed BattTrax to try to get a better idea of what is going
> on. When I started charging, capacity was at 19%, battery temp
> was about at
> 27C, and my current was right around 1020mA. It charged normally
> for about 2
> minutes -- during which time the capacity rose to 21% and the
> battery temp to
> 27.5C while current stayed relatively stable.
> Then, suddenly, capacity jumped to 100%. The graph in BattTrax
> ust goes from
> 21% to 100% in one 2-second interval. Battery temperature, at
> that 2-second
> interval, dropped to 27C again, and charge current to 0.
> It then just stays there doing trickleChargeContinuous at 0-1mA only.
> Forever.
> Is this a situation where I should start trying fridge/freezer tricks? Is
> this a battery temperature issue? Or batteries that just aren't going to
> recover?
> Any suggestions appreciated. All 3 of my nimh packs seem to be giving the
> exact same behavior (on different Newtons, just to note that I
> don't think it
> is specific to a Newt).
> Thanks!
> - John...
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