Dual Battery Compatibility Compatible with 4.2V lithium ion and polymer batteries and 3.6V LiFePO4 batteries. Simple selection provides versatile charging solutions for various power tool batteries and DIY projects. Efficient 1A Charging Performance Delivers a stable 1A constant current charging using DCDC stepdown technology. Reduces input current to approximately 0.7A, minimizing heat generation and eliminating the need for additional heat dissipation during operation. Compact and Heat Management Design Ultrathin form factor: 21.5 mm x 14.5 mm x 4.2 mm. Exposed copper backing enables easy heat sink installation, enabling effective thermal dissipation in tight spaces while maintaining stable charging performance. Intelligent Safety Features Builtin overheating protection automatically reduces current to prevent burnout. Automatic charging termination and a dualcolor LED status indicator provide realtime charging progress information. Use scenarios Onsite tool maintenance: Charge 4.2V Liion or LiPo packs for cordless drills, screwdrivers, or other handheld tools in the workshop or at the job site. DIY and backup systems: Maintain LiFePO4 3.6V battery packs used in home solar setups, offgrid electronics, or small backup power projects. Hobby electronics and RC projects: Safely charge small 4.2V Liion/LiPo packs for RC cars, drones, or portable gadgets in spaces with limited room and where heat management is a concern.