Consumers should remember to always charge Everready NiMH Energizer Rechargeable batteries before the first use. Use an Energizer Smart Charger designed specially for NiMH batteries, as these charges protect the cells from overcharging and undercharging. Some Smart Chargers will charge Energizer batteries in as little as fifteen minutes. To charge the batteries, insert them into the charger and look for the LED light. Most models will hold steady, flash, or turn off to determine the state of the battery charge.