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Model Forum / Radio Controlled / Air Models / November 2007How long to charge Li-Polymer between flights?
Hi, Am thinking about getting an electric trainer such as Multiplex Magister. Is it possible to re-charge the Li-Polymer cells in the field using an SLA or car battery? If so, how long would this take? Cheers, Kenny > If so, how long would this take? Charge at a 1C rate and it will take an hour. >> If so, how long would this take? > > Charge at a 1C rate and it will take an hour. One hour 20 to one hour 40. The charge tapers towards full voltage. | Is it possible to re-charge the Li-Polymer cells in the field using | an SLA or car battery? Absolutely. We do it all the time. Don't use a car battery unless it's actually in a car, however -- buy a deep cycle battery instead. Using car batteries in situations where they aren't usually kept fully charged greatly reduces their lifespan. | If so, how long would this take? Most LiPos are charged at 1C, so if your battery starts out completely dead (which is unlikely) you're looking at an hour, perhaps a bit more as the charge rate usually slows down at the end. Of course, usually it's not fully discharged when you charge them, so it'll probably be a little faster than that.  SignatureDoug McLaren, dougmc@frenzied.us Things have taken a turn for the surreal. > | Is it possible to re-charge the Li-Polymer cells in the field using > | an SLA or car battery? [quoted text clipped - 13 lines] > Of course, usually it's not fully discharged when you charge them, so > it'll probably be a little faster than that. My average recharge time is around 25 minutes on not more than half flat stuff. |
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