Why Li-ion Battery?
lithium-ion batteries are Fast Charging, have a High continuous Charging and discharging current(Mah), last longer, and have a high power density for more battery life in a small package.
What is a C rating?
C-rating is a rating of the battery which determine how much amount of maximum current can battery needed to get charge or discharge
Simple formula is
(Ah rating * C rating)
Battery 18650 3.7V 2000mah 3C Mean 2Ah *3 C rating=6Ah