Energizer rechargeable batteries in Energizer batteries(59)

How long can rechargeable batteries be left on the charger?

You shouldn't leave rechargeable batteries on the charger for longer than 24 hours. Most charging stations are made to revert to a trickle charge once the battery is fully charged, but you'll waste energy and money if you leave the batteries sitting for longer than they need to be. Plus, some rechargeable batteries can be damaged if they sit for too long.

How many times can rechargeable batteries be used?

Rechargeable batteries can be reused up to 1,000 times before they need to be replaced. It's one reason why rechargeable batteries are a handy and eco-friendly replacement for regular batteries.

Are rechargeable batteries good for smoke alarms?

No, rechargeable batteries shouldn't be used in smoke alarms because they aren't guaranteed to trigger the beeping sound that lets you know it's time to change the batteries. You should either hardwire your smoke alarm or use a single-use 9-volt battery.