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BrianG · 11.19.2007, 04:23 PM

lol, that darn mAh thing! To make sure you have a 12v battery large enough, multiply your max pack voltage (4.2v/cell for lipos or ~1.4v/cell for NiMH) by the Ah rating, multiply that by 1.2 (for charger efficiency), then devide that by 12v to get the minimum Ah rating of the 12v battery. So, if charging a 4s 8Ah pack, you need a 12v battery Ah rating that is at least 12Ah.

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BrianG RC-Monster Admin Offline Posts: 14,609 Join Date: Nov 2005 Location: Des Moines, IA	11.19.2007, 04:23 PM lol, that darn mAh thing! To make sure you have a 12v battery large enough, multiply your max pack voltage (4.2v/cell for lipos or ~1.4v/cell for NiMH) by the Ah rating, multiply that by 1.2 (for charger efficiency), then devide that by 12v to get the minimum Ah rating of the 12v battery. So, if charging a 4s 8Ah pack, you need a 12v battery Ah rating that is at least 12Ah.