I like to drive hiking trails in my trucks but I have to carry 20 lbs of batteries or carry my rigs home. I've seen 10,000 and 12,800 MaH batteries (Traxxas 7.4v 2s 25c). 1 amp per 1000MaH would be 10 amps, my charger only charges up to 5 amps, would it hurt to charge at that or just take longer? Is there anything else I should know before buying these at $130+??