![Universal D5629/6F22 9V 2-PK Heavy Duty Batteries.](http://ecx.images-amazon.com/images/I/31H61-BScdL._AA200_.jpg)
Average Reviews:
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(More customer reviews)One came dead. The other only lasted 1 month in a smoke detector. Good thing it's cheap.
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Universal Batteries are 99.999% Mercury free and are designed to last a long time. 2 pack of 9V batteries
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