Description:    A great accessory for battery "peace of mind". Quickly and clearly displays the voltage levels of your battery packs. Total voltage and remaining capacity are shown on a bar graph and as a percentage. Can check 2-7 cell LiFe, LiPo and Li-Ion packs, as well as 4-7 cell NiCd and NiMH packs. Voltage of each cell of a lithium battery pack can also be displayed. Operates on power supplied by the connected battery. Know BEFORE you go just how much battery life you have! Specs and Features Voltage Display Error: +/- 1.5% Dimensions: 3.3 x 2.5 x 0.6 in (85 x 63 x 15 mm) Weight: 1.8 oz (52.6 g) Total Voltage (Ni type): 4.0-17V Total Voltage (Li type): 5-34V Cell Voltage (Li type): 1.1-4.9V Operating Temperature: -10 to +45C Storage Temperature: -20 to +60C