Palo C905W 4 Slot LCD Display AA AAA NiCd NiMh Rechargeable Battery ChargerFeatures: Short circuit protection to prevent short circuit and ensure use safety Auto identify function: Identify the non rechargeable batteries, short circuit batteries and defective batteries, then the charger will not charge it to ensure safety usage Refreshing battery function: It can activate and repair waste battery ( voltage is low 0 0. 9V ) Auto power off function: If the batteries are fully charged, the charger will cut off the power supply