I'm pretty sure I packed a 600mAh spare if you think that will suit your needs. I'm Andrew Hamilton and will be in the Australian camp. See you on the playa! On 11/09/2013 8:40 AM, "Sam Fineberg" <s...@fineberg.net> wrote:
> Peter, > You might ask Mike @ BAR. He had some Telemetrium gear the last time I > looked. He might be able to pull a battery out of a bundle kit if you > asked nicely. > > Sam > > On 9/10/2013 3:23 PM, Keith Packard wrote: > > Peter Hackett <peter.hack...@cal.berkeley.edu> > <peter.hack...@cal.berkeley.edu> writes: > > > I'm off to Black Rock on Thursday. Not sure I'll be able to replace it by > then. > (I'm assuming it would be hard to find the right battery locally) > > > Yeah, we use the same connector as some helicopter batteries, but the > polarity is reversed, which would destroy both battery and board if you > plug them together. > > Bdale has a pile of current stock, but he's in California until tomorrow > evening. I don't have any of the larger size left at this point or I'd > offer to ship one from here. > > We get them from SparkFun though, and they do offer overnight shipping: > > https://www.sparkfun.com/products/341 > > However, if you want to use them to fire charges, you'll need to remove > the current limiter board. If left in place, the battery will shut down > as soon as you try to fire a charge, leaving the board dead in the > air. Older SparkFun batteries had a different protection circuit which > worked fine with TeleMetrum, newer SparkFun batteries nearly always fail. > > It's a pretty simple soldering job, if you're up for the adventure. > > http://www.altusmetrum.org/Documents/FixBattery/ > > Anyone want to chime in on whether AAA's will be big enough? > > > Also, I guess I should be concerned about battery internal resistance. > Will 3 standard alkaline > batteries in series be able to provide enough current to light the > e-matches? > > > Not recommended for a couple of reasons: > > *) TeleMetrum will try to charge them when plugged in over USB. There's > no way to disable the charger, and the board cannot run without a > battery in place. > > *) AAA batteries have a higher internal resistance than lithium > polymer batteries, which means if you try to fire an e-match, the > voltage seen by the board will drop low enough to reset the board. > > > RE over-charge: > > Can that happen using the TeleMetrum to do the charging? > > > The charge controller on TeleMetrum shouldn't be able to overcharge an > undamaged battery. I've left them plugged in for weeks at a time without > problems. > > -keith > > > > _______________________________________________ > altusmetrum mailing > listaltusmet...@lists.gag.comhttp://lists.gag.com/mailman/listinfo/altusmetrum > > > > _______________________________________________ > altusmetrum mailing list > altusmetrum@lists.gag.com > http://lists.gag.com/mailman/listinfo/altusmetrum > >
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