[altusmetrum] Bulging LiPo battery

Peter Hackett peter.hackett at cal.berkeley.edu
Wed Sep 11 14:03:18 MDT 2013


Thanks Keith. Especially for:

> ... appears to be rated to only 4.4V. 3 AA batteries
>  will nominally run 4.5V; .. doesn't bode well for the health of this
power supply...

I tried this out last night but only had it plugged in long enough to hear
the
"I'm horizontal and okey-doky" beeps.

Hopeful a few seconds won't have done any lasting damage.



On Wed, Sep 11, 2013 at 12:13 PM, Keith Packard <keithp at keithp.com> wrote:

> Peter Hackett <peter.hackett at cal.berkeley.edu> writes:
>
> > I charged the battery by plugging it in to a USB charger.
> > I *did* leave it for (I think) two days. But it sounds like this should
> be
> > OK.
>
> Should have been, unless the battery was broken.
>
> > I've always had "trouble" with charging (at the very least "confusion")
> > I've had situations where I know it needs charging (software says the
> > voltage is
> > low) but the charge light doesn't go on (usually.)
> > So I now just "plug it in (for a long time) and check it".
>
> If it's been with this same battery, then I suspect it was damaged some
> time ago.
>
> > So it looks like the only (quick, complete) solution is a new battery
> that
> > I modify
> > by removing the protection circuit.
>
> Right, any 3.7V lithium polymer battery should be fine; you can get
> these at many hobby stores that sell RC vehicles. Just take the wire off
> the dead battery and stick it on a good one and you should be in great
> shape.
>
> > Given your information, it seems like other possibilities are:
> >
> > - Use 3 AAA batteries to power the TeleMetrum.
> > - Use a separate Pyro battery as documented at
> >   http://www.altusmetrum.org/Documents/SeparatePyroBattery/
> > - (don't plug the TeleMetrum into USB)
> >
> > OR
> >
> > - Use 3 AAA batteries to power the TeleMetrum.
> > - Use my StratoLogger to fire the e-matches.
> > - (don't plug the TeleMetrum into USB)
>
> Hrm. There's a LTC1682 5V charge-pump supply on TeleMetrum for the
> accelerometer and that appears to be rated to only 4.4V. 3 AA batteries
> will nominally run 4.5V; I'd assume at full charge they'd be slightly
> higher, which doesn't bode well for the health of this power supply...
>
> -keith
>
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