... 12 hours for normal use after charging for 4 hours. Digital Multimeter performs AD/DC Voltage, AC/DC Current ... TesterPROVideo TestSignal modeNTSC/PAL (Auto adapt)Display3.5 inch digital TFT-LCD ,960 x 240 resolutionLCD adjustmentBrightness, Contrast, ... 3.7V Lithium polymer battery ,3000mAhRechargeableAfter charging 3-4 hour, working time lasts 12 hoursLow ConsumptionEnergy saving ...