Review on 🔋 POWXS Rechargeable 9V Battery and Charger Set – 2 Count NIMH 280mAh 9 Volt Batteries for Smoke Alarms, Guitar, Cameras, Toys & More by Mindi Gefroh

Edit: After reading my review the seller contacted me and sent a new set of batteries. I was able to switch between 4 batteries and use the TENS unit while sitting at my desk for long periods of time. Very happy with their customer service. I got them installed in a TENS box as I was getting less than 7 hours from a regular 9 volt. I used them for 5 days so charged them up and used them a couple of times. Unfortunately, I get less than 3 hours of use from each battery. I like that I can sit at my desk and change them regularly. I expected a longer life.