Designed for 2,3 and 4-cell Li-Po packs, these neat little items of electronic wizardry will show you the state of each cell using highly visible lights, ranging from red flashing, through to orange or green, depending on the power in each cell. The units are priced at - 2-cell 5.50, 3-cell 6.50 and 4-cell 7.50.

They're plugged for JST-XH packs and available from Al's Hobbies.

See the Al's website for more information.