Energizer Rechargeable 9 volt Battery, (NH22NBP)

I've had this in my smoke detector for the past year, and the voltage is still holding up well even though I haven't recharged it. So, although this battery doesn't state it's low-self-discharge, it appears to be. It may not be cost-effective (compared to alkalines) in a low-drain device like a smoke detector, but I know I can charge it up and it's like having a fresh battery always on hand. Plus, NiMH batteries won't leak and ruin your device, like alkalines can. This would be very cost-effective in something that uses more power, like a mic or remote for a RC toy.

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I bought this product for my TENS machine which I use almost on a daily basis. I used to buy normal batteries for the TENS and ended up spending quite a lot on batteries weekly. The rechargeable Energizer has proved to be very economical.

Does the job.

Good