Tenergy Centura 9V NIMH Rechargeable Batteries, 200mAh Low Self-Discharge Square Battery for Smoke Alarm/Detector, 4 Pack

Long lasting power - Tenergy' s 4 pack Centura 9 volt battery for smoke alarms offers the. Generate energy savings by switching from standard single-use 9V size batteries to rechargeable batteries.
Low self-discharge - Centura 9 volt size battery is a low self-discharge 9V battery, which means it can retain up to 85% of capacity when properly stored and unused for up to a 1 year.
Extended cycle-life - Rechargeable up to 2, 100 times without significant capacity lost.
Money saving eco-friendly - Tenergy rechargeable NiMH 9V battery pays for themselves after 10 cycles. Avoid wasting time and money on the disposable alkaline batteries and replace them with our rechargeable Centura Rechargeable 9V Battery to decrease the waste disposables leave behind.
Precharged ready-to-go - Use these rechargeable NiMH 9V batteries when first received, or fully recharge them for the best experience. These batteries are UL certified and include 12 months warranty.