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Old Apr 24, 2012, 04:59 AM
I've got gas
BrightCap232's Avatar
United States, PA, Quakertown
Joined Aug 2011
365 Posts
Discussion
Lipo as a p/s

Do any of you guys use a lipo pack as a power supply to charge batteries at the field?
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Old Apr 24, 2012, 05:42 AM
Proud to eat Kraut ;-)
Julez's Avatar
Germany
Joined Dec 2003
5,213 Posts
Well, I use a 4s A123 pack to charge RX packs at the slope.

But any 3s or 4s Lipo should work equally well. Just be sure not to over-discharge it. Search ebay for "lipo alarm". There are cheap ones with a double piezo buzzer, LED display and ajustable low voltage alarm. Adjust them to 3.7V/cell, and put them on the balancer cable. Then you know when to stop using that pack for charging when the alarm goes off.
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Old Apr 24, 2012, 05:55 AM
I've got gas
BrightCap232's Avatar
United States, PA, Quakertown
Joined Aug 2011
365 Posts
I guess if I wanted to do this I should get a high mAh battery?

Good idea on the buzzer.
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Old Apr 24, 2012, 10:08 AM
Frankenstein recycled packs
rampman's Avatar
USA, AZ, Gilbert
Joined Jan 2006
8,706 Posts
Bigger is better as it is like a fuel tank. You can only siphon a gallon of gas from a gallon tank but 20 gallons of gas from a 20 gallon tank.
IMO, don't buy new packs for this. Work the system for old, unwanted, tired packs. Many can deliver decent mah under very light loads but fall on their face when pushed hard. Depending on what you are charging a 3S or 4S 2200 may work great for charging several small 1S packs but as your cell count and size goes up so does the hole size in your leaking fuel tank.

Rick
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Old Apr 24, 2012, 10:19 AM
I've got gas
BrightCap232's Avatar
United States, PA, Quakertown
Joined Aug 2011
365 Posts
It's mainly gonna be for 2S and 3S 450 mAh packs an maybe some 3S 2100's. The 450's I'll probably do in parallel at 1 maybe 2C.
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