For 2- to 5-cell Li-Po packs, Thunder Powers new Smart Balancer cant be beaten. It automatically detects the number of cells, and automatically balances packs with or without charging them. Monitor balance status using the easy-to-read LED indicator, which also warns you (along with an audible beep) if your cell is overcharging. The Smart Balancer also features advanced software and a data port that lets you interface with future Thunder Power chargers.