9V Batteries 9 Volt Rechargeable 850mAh 9V Lithium Batteries for Smoke Alarms, Electronic Toys and More(2 Count)

This battery is not only quality built it is built to use over and over. Each battery is individually wrapped and sealed in cellophane for future use and storage. I bought them mainly for my smoke alarms. They work great in other applications and are easy to recharge. I just rotate out the old one and and put it in a charger overnight and replace it with one I have already charged. It's great to finally have an inexpensive way to stay safe.

These are additional batteries I am getting, because 4 are not enough even for a small house! I counted that I will need 9 to cover my entire house, so I go ahead order four additional. These Li-ion batteries should be stable due to the widely used in cell phones, and to my understanding, the memory effect that makes the NiCd or NiMH rechargeable die sooner than expected will not be an issue on the Li-ion batteries. Although I have not used them long enough to say that they won’t break yet, but since they uses the same technology as the cell phone batteries, I will happily trust them. I now have all my smoke detectors and garage door opener remotes replaced, and it should give me a peace of mind for years…

Each rechargeable 9V battery can last long for 72 hours. I have built a car alarm system operated by a 9 volt battery. I have to change battery every 72 hours.I bought 4 9-V rechargeable batteries and they all work perfectly as I expected. I save money for the long use.I will order some more 9V rechargeable one for my other electronics projects.

we use our portable pemf device daily and enjoy the portability with these long lasting batteries that allow us to use our portable pemf device w/o being tied to the electrical outlet! definitely will order batteries from them again when these 9volts go bad... has already paid for themselves compared to the long lasting disposable 9volts!

These rechargeable 9V 850mAh batteries are okay, but not as powerful as some older 650mAh rechargeable Powerbowl and Keenstone batteries I have. I expected these to be better.

The lithium ion batteries work well. They come charged and allow for reusable use in my smoke detectors. If they can be recharged twice it would be equal to the good alkaline batteries. Should be a smart buy

Good sign took over an hour to charge based on others that took less then 30 min. Used for my digital safe, 2 weeks so far and holding strong.

Does not hold charge. Did not fit into charger very well.