The TENERGY PREMIUM 9V BATTERY : 250MAH NIMH generates long-term energy savings by switching from alkaline household batteries to rechargeable batteries. These Premium Rechargeable NiMH batteries are trusted by photographers to deliver a faster refresh rate than single-use alkaline batteries. These Premium NiMH batteries are enhanced to deliver consistently high power performance, whether outdoors in -4°F or 122°F. Tenergy Premium rechargeable batteries are reusable up to 1,200 times and quickly pay for themselves after 10 uses. Avoid wasting time and money on disposable alkaline batteries and replace them with rechargeable 8.4V batteries to decrease the waste disposables leave behind. Tenergy Premium 9Vs are designed with a no-leak design. These batteries are UL-certified and are backed with a 12-month warranty period.