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2 questions for my first time 4S 280ah build: 1) If my battery is 280ah, what size BMS do I need (280a as well)? 2) Do you recommend getting a smart BMS or without the "smart" function? I saw Will using a 250a Daly BMS for a 250ah LifePo battery - why get a 'smart' BMS or not? What situation...