HixonRechargeable 9V Batteries 850mAh High Capacity 9V Batteries (4 Pack) 9 Volt Lithium Batteries for Smoke Alarms Multimeter Flashlights Metal Detector Electronic Toy & More(Charger NOT Included)

I got these batteries in mid 2022 to use in my old TENS unit which I run continuously all day while at work on my back where I would go through the normal alkaline non-rechargeable batteries in about 1 day of use, but 1 of these works All day at work & recharge it at night and take another battery off the charger at night and after over 2 years of CONSTANT use on them they're still working as well as the day I originally bought & started using them!!! If I needed more 9V batteries I wouldn't hesitate to buy these again. Although mine are the older black & brown color scheme version.

I have started replacing all my conventional batteries with these lithium batteries. The seem to work as long or longer and have many recharging cycles.

Excelente

Im very happy with these batteries. I have purchased many of them for things all over the house, in many sizes as well. All my remotes work with them now as well. When they say there is a constant power source till they drain they are right. You will know right now when they are drained, the remotes just stop working all together till new batteries are installed or your charge them. No questions if they are drained or not. They hold up well and take a charge well. I have had several for a year now and really like them. I stay with lithium from this point forward. I cant say how long they will hold up and keep charging but so far no failures. I would and will buy again.

I use these in my guitar effects boxes and my Fishman acoustic (piezo) preamp. Honestly, I replaced the lower capacity batteries I was using cuz when you add up sound testing and stage time, my boxes are live for quite a while an I need that max capacity rating. Ditto for rehearsal and personal practice time. It is simply too damn expensive (and bad for the environment) to keep buying alkalines cuz some of my boxes eat batteries fast. I got spares to keep in my guitar case just in case. I also got an 8-slot charger so in one go I can have all my batteries at max charge.

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…

After a few uses none of the batteries will hold a charge

I don't like the weird way they charge, with a little cord that plugs into a hole on the battery. I thought they would charge like conventional rechargeables, by plugging the contacts onto a base charger.