The Makita DC18SD 240V Li-ion 9.6v - 18v 30-60 Minute Charger uses CPU communication with the battery's memory chip to determine the optimal charging method, thereby extending battery life. It features built-in sounds to indicate charging status and completion. The charger is designed for batteries up to 3.0Ah and incorporates Makita's Forced Air Cooling Fan technology, which cools the battery via built-in air vents during charging to prolong its lifespan.