If you want a battery that lasts, we've done the research for you. In our quest to find the best alkaline batteries on the market, we tested several models and brands. Our evaluation included ...

9V batteries are often found in devices that aren’t used very often. If you use a NiCd rechargeable battery you may find it completely discharged by the time you need it. Capacitors on the other ...

The type of smoke alarm, the device's power drain, and how often the alarm is triggered also plays a role in the battery longevity. Generally, the best 9v battery for a smoke detector may last ...