Peter Hackett <peter.hack...@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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