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Model Forum / Radio Controlled / Air Models / May 2010Maximizing the life of the tiny LiPos ???
I am flying planes and helicopters that take the new tiny little LiPos, from 70 mAh to 150 mAh at 3.7 volts. I already know that the most important thing it to make sure that they are not discharged too much. I use a timer for this. I was told that it is not good to leave them in the charger. Also I have read that the best storage charge is 50%. I don't know how to do this with these tiny little batteries. E-Flite said to simply keep them fully charged, and recharge them once a month if in storage. They also said that they should be charged at least until the charger flashes every 20 seconds. Does anyone here have any more ideas about extending the life of these tiny LiPos? For Li-Polys, the consensus seems to be to store packs at about 85% of peak. That works out to about 3.85V per cell. >I am flying planes and helicopters that take the new tiny little LiPos, >from 70 mAh to 150 mAh at 3.7 volts. [quoted text clipped - 12 lines] > Does anyone here have any more ideas about extending the life of these > tiny LiPos? > For Li-Polys, the consensus seems to be to store packs at > about 85% of peak. That works out to about 3.85V per cell. (1) I seem to recall that all the stuff that I read said 50% charge, perhaps I am remembering incorrectly. (2) What is the best way to determine the voltage of the little tiny 70-150 mAh batteries? >>I am flying planes and helicopters that take the new tiny >>little LiPos, from 70 mAh to 150 mAh at 3.7 volts. [quoted text clipped - 15 lines] >> Does anyone here have any more ideas about extending the >> life of these tiny LiPos? >> For Li-Polys, the consensus seems to be to store packs at >> about 85% of peak. That works out to about 3.85V per cell. [quoted text clipped - 3 lines] > (2) What is the best way to determine the voltage of the > little tiny 70-150 mAh batteries? With a volt meter. But 1/2 voltage isn't 1/2 charged -- 1/2 charged means that you've sucked out half of the total amp-hours that the thing can hold. Pull a LiPo down to 1/2 voltage and it's toast.  SignatureTim Wescott Control system and signal processing consulting www.wescottdesign.com >>> For Li-Polys, the consensus seems to be to store packs >>> at about 85% of peak. That works out to about 3.85V per [quoted text clipped - 9 lines] > amp-hours that the thing can hold. Pull a LiPo down to > 1/2 voltage and it's toast. Where do I get a voltmeter that will work with the tiny little cells? >>>> For Li-Polys, the consensus seems to be to store packs >>>> at about 85% of peak. That works out to about 3.85V per [quoted text clipped - 11 lines] > Where do I get a voltmeter that will work with the tiny > little cells? Your confusion confuses me. Any old voltmeter will do, as long as you can get their probe tips on the wires. Try Radio Shack. SignatureTim Wescott Control system and signal processing consulting www.wescottdesign.com >>>>> For Li-Polys, the consensus seems to be to store packs >>>>> at about 85% of peak. That works out to about 3.85V [quoted text clipped - 16 lines] > > Try Radio Shack. I was able to make an adaptor for my Watts Up watt meter. It seems to work very well when the battery is fully charged. When the battery is nearing its cut-off the LCD display gets dim. What is the recommended minimum voltage for these LiPos to maximize their lifetime? >>>>>> For Li-Polys, the consensus seems to be to store packs >>>>>> at about 85% of peak. That works out to about 3.85V [quoted text clipped - 24 lines] > What is the recommended minimum voltage for these LiPos to > maximize their lifetime? Y'know, I'm drawing a complete blank. Battery chemistry is battery chemistry though, the voltage is invariant to size -- currents and capacity scales with size, but the voltage is a consequence of the chemistry which does not change. So whatever is recommended for regular LiPo cells is what you want to follow for the teeny ones. SignatureTim Wescott Control system and signal processing consulting www.wescottdesign.com >>>>>>> For Li-Polys, the consensus seems to be to store >>>>>>> packs [quoted text clipped - 39 lines] > change. So whatever is recommended for regular LiPo cells > is what you want to follow for the teeny ones. I will guess that 3.66 volts is reasonable, and conservative. I am pretty sure that this was the most conservative number that I have encountered. if you charge your lipo's at a very low amperage, you will extend the life greatly. charge slow, and dont drain to low each cell should be discharged no less then 3.6 to 3.7 if you wish to use your batteries 100+ cycles Signaturehttp://www.skyhighhobby.com |
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