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Due to the improvement of the Lipo technology, now days most of the Lipo batteries are able to be charged by 2C to 3C and some even go up to 6C. Assuming regular rc car lipo is 5000mah capacity that means 2C is 10A and 3C is 15A of the charging current. So a higher amp output charger is necessary in order to get out the punch form your battery as the more charge amp equals better punch. This is very important especially in stock class racing.

Specifications:

Operating voltage range: 11.0-18.0V 　
Circuit power: max.400Watts(charging) max.25Watts(discharging)
Charge current range: 0.1-20.0A
Discharge current range: 0.1-5.0A
Current drain for balancing LiPo: 200mAh/cell
NiCd/NiMH battery cell count: 1-18cells
Lithium battery cell count: 1-6 series
Pb battery voltage: 2-24V
Weight: 820g
Dimensions: 152×145×57mm