CellMeter 8 is a testing instrument that can detect battery status, and the detection battery type includes most rechargeable batteries. The battery types are:Li-Ion (lithium-ion battery), Li-Po (lithium polymer battery), Li-Fe (lithium iron battery), Ni-Cd (nickel-cadmium battery), NiMH (nickel metal hydride battery) Lithium battery type (Li-Po, Li-Ion, Li-Fe), CellMeter 8 can support 2S-8S without additional power supply. Test 1S lithium battery, You need to connect a nickel battery larger than 3S or UBEC 5V to NiCd/MH port to provide working power for CellMeter 8. Nickel battery type (NiCd or NiMH), CellMeter 8 can support 4S-8S without additional power supply, if you need to test nickel less than 4S battery, you need to connect a 2-8S lithium battery to the Lithium port to provide working power for CellMeter 8. Colour:black/Blue Material:plastic Size:90 x 58 x 21MM Package Contents: 1 x battery tester Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.