Review on 🔋 Long-lasting 9V 6F22 High-Power Batteries - 24-Pack for Smoke Detectors & Electronics by Tiffany Powers

I am using 9V batteries in a TENS unit that draws no more than 120mA at maximum setting. Other 9V batteries (Energizer, Duracell, Revain Basics) last at least 4 hours under these conditions. I dropped one of them and turned on the device. and in about 5 minutes he was dead. Tried another one. received maybe 7 minutes before death. I checked with a multimeter - yes, one showed 5.8V, the other - 5.5V. More dead than 9V should work. I tested the voltage on two unused ones, 8.6V and 8.5V (normal for fresh 9V). Even if they lasted 10 minutes (= 0.17 h), they would have a capacity of 20 mAh. The 9V ZnC batteries should have a capacity of approx. 500 mAh. This means that these baddies have less than 5% capacity of the correct (ZnC) 9V.