C = discharge rate. example : 2000mah battery rated at 15C (given constant discharge) to know the maximun amp you can draw from your battery, 2000mah x 15C / 1000 (1000ma = 1amp) = 30amps max draw
know your motor's amp draw to know what battery to buy. if your motor has an amp draw of less than 30amps, ur safe on a 15c with 2000mah capacity. If it goes above 30amps then get a battery with a higher c rating or capacity.
ex: an eg1000 will draw 20amps cranking an m120 spring.
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