True cigarette lighter outlets are usually fused at 8 amps, so regular charging should work just fine. I've charged many batteries using a cig lighter outlet while driving to races.
"power outlets" are generally fused at 15 amps or so. The limiting factor is how good the contacts are.
AE FT B44.2, SC10, T4, B4.2, B4, 18T, 18R, TC4, L3.5O ** Losi MRC Pro ** CRC Carpet Knife ** Axial XR10, AX10, SCX10 ** Traxxas EMaxx ** JR Z1