1, check min. voltage (V), power (W), energy (Wh) & charge (Ah) 2, perfessional battery tester 3,Good perfermance Table 1 Electrical Measurement Ranges ParameterRangeResolutionNotesVoltage0* - 60 V0.01 V*0 V min. w/ auxiliary power. E.g. a receiver battery. Else 4.0V.Current0 -100 A peak0.01 A50 A continuousPower0 - 6554 W0.1 WCharge0 - 65 Ah0.001 Ah0-6554 Ah for Doc Wattson. 0.1Ah ...