Functioning as stand-alone battery management system, 3-to-8 cell Model ISL94203 accurately monitors, protects, and cell balances rechargeable battery packs to maximize battery life and ensure safe charging and system operation. Device integrates cell voltage level shift, automatic cell balance, 14-bit ADC, current sense monitor, power FET control, and temperature sensor interface. In event of catastrophic failure, IC includes feature that blows polyfuse to render battery pack inoperable.