ISL94203 Li-ion Battery Pack Monitor Renesas ISL94203 Li-ion Battery Pack Monitor is a Li-ion battery monitor IC that supports 3 to 8 series-connected cells. This Renesas battery monitor IC provides full battery monitoring and pack control. Renesas ISL94203 provides automatic shutdown and recovery from out-of-bounds conditions and automatically controls pack cell balancing. This battery pack monitor is highly configurable as a stand-alone unit but can be used with an external microcontroller, which communicates to the IC through an I2C interface.