Stage 1 charging, is the first stage of a three stage charging process that is designed to maximize battery health and efficiency. In this stage, the charger uses the highest voltage and current to recharge the battery as fast as possible. This stage returns about 80% of the battery’s capacity. The charger operates in constant current (CC) mode, meaning the current is fixed and the voltage rises as the battery is recharged. The primary goal of this stage is to rapidly charge the battery to a certain voltage level, typically around 80% of its full capacity, without allowing the voltage to exceed a safe limit.