Full charge is preceded by charge qualification.
During qualification, full-charge current is inhibited if the battery voltage is below an internal threshold, indicating a deeply discharged or shorted pack. Consequently, the IC applies a low-current trickle charge in an attempt to revive the battery or to close the pack protector's discharge switch. Once the battery voltage reaches the internal threshold, full charge begins. An accurate voltage-regulation phase completes the charge. These boards feature the proprietary AutoComp technique to compensate safely for the internal impedance of the battery and any voltage drop in the protection circuitry.