The OEM Energizer NiMH Battery Charger EVECHFC is designed to charge NiMH and NiCad batteries in various cell sizes including AA, AAA, C, D, and 9V. It charges batteries in approximately 3 to 7 hours and features an automatic shut-off function when batteries are fully charged, along with a built-in safety timer to prevent overcharging. The charger includes LED status indicators to inform you of the charging progress and incorporates bad battery detection, short circuit/reverse polarity protection, and delta V charging cut-off for enhanced safety.