Nitecore D4 Digicharger - Multi Battery typeIntelligent circuitry detects the battery type and status before entering automatic charge mode (CC, CV, dV dt) Automatically detects battery power status and selects the appropriate voltage and charge mode (with the exception of LiFePO4 batteries which require manual selection) Compatible with LiFePO4 batteries Compatible with small capacity batteries Automatically stops charging when complete Features over charge prevention to protect batteries