4-Pack Rechargeable 9V Batteries, 1300mAh 9 Volt Lithium-ion Long Lasting Power, USB-C Recharge with 2 in 1 Charging Cable for Smoke Alarms,Multimeters,Microphones,Walkie-Talkie,Toys

I purchased these to replace a couple of rechargeable 9v batteries in the wireless mics that my Pastor threw away forgetting they were rechargeable. I was intrigued by the USB charging. They seem to hold a charge as long as the other that I have. The ability to plug them into a USB charger is great.

I like you can charge the batteries via USB-C or a regular battery charger.... Good value and the batteries function very well....

nifty to have on hand, saves money and helps the environment

I bought these because I was tired of buying 9v batteries for my bass guitar. These are wonderful! I keep one charged by my guitar and one inside...when the battery runs out, I just swap it. Also, they charge with USB-C. Fantastic idea!Now the batteries do not last as long as normal 9v batteries in my guitar. I'd say 1/2 to 3/4 the duration. However, they are easy to swap and charge so I don't mind.

I didn't know there were rechargable 9V's and these are awesome because they don't need a special charger, just a cable. I was getting sick of spending so much money on non-rechargable 9V batteries. So far, I've loved these, and they are replacing all my non-rechargeables in the house now. Good price, shipped quickly, and work great.

works great

Better than what I was expecting

I'm attempting to power a small hand held neurostimulation device. When I use a traditional 9v battery the device powers up just fine. When I use these batteries the device does not power up. The concept is great but these batteries do not work for my device, sadly. Hence, I'm providing a 1-star rating.