Cordless power tool battery chargers work by using mains electricity and recharging the discharged battery. The charger is connected to the power supply and the battery is inserted into the charger. It then converts the electricity from the power supply to a level suitable for the battery. The electricity is stored in the battery until your cordless tool requires it. Most chargers have a built-in protection feature that ensures the charger shuts off when the battery is full. The question is do all chargers look the same? The answer is no. Each brand of cordless power tools has developed specific charger models for their line of tools. That's why we recommend always charging batteries with the same brand of chargers. The Ronix 8694 fast charger with 12 V and 1.0 Ah ensures that you always have a fast-charging system and also offers maximum safety with the integrated safety mechanism. Plus, the Ronix 8694 fast charger is equipped with a battery protection cut-off system. When the battery is fully charged, this system prevents excessive current from entering the battery, thus preventing damage to the battery by turning on its green LED light and shutting off power.