Compact universal charger designed specifically for 3.6V-3.7V lithium-ion batteries. Features intelligent charging circuitry that automatically detects battery type and adjusts power delivery for safe, efficient charging. Compatible with a wide range of standard cylindrical battery formats. LED indicator shows charging status at a glance. Includes protective overcharge and short-circuit safeguards to extend battery lifespan. Perfect for powering flashlights, portable devices, and other electronics that rely on 3.6V-3.7V batteries. Durable construction built to last through countless charge cycles.