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 <[email protected]> wrote: > Peter Hackett <[email protected]> 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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