Quzmo Rechargeable 9 Volt Lithium-ion Batteries, 1300mAh Long Lasting Power, USB-C Recharge with 2 in 1 Charging Cable for Smoke Alarms,Multimeters,Microphones,Walkie-Talkie,Toys (6-Pack)

Great, easy to use/recharge. I just had to throw out a half dozen batteries which had died waiting to be used! Now these will ensure that I always have a 9v battery when I need one. I had already upgraded all of my other batteries to rechargeable ones and didn't know they made these.

These rechargeable 9V batteries are a lifesaver! I use them in smoke alarms, a multimeter, and even a mic – they hold a charge really well and perform just like regular 9Vs. The 1300mAh capacity gives them great staying power, and the USB-C charging with the 2-in-1 cable is super practical. No more hunting for replacements or wasting money on disposables. Solid build, reliable power – very happy with this purchase!

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.

Love this idea. Has a light to show charge and dual cable. Hope to save some money with these in smoke detectors.

Prompt delivery. batteries tested full 9v output when received. Proceeded to charge batteries to full capacity. USB connectors fit snugly-batteries charged in accordance with specifications, showing red while charging and turning green when fully charged. Voltmeter test after batteries were fully charged indicated same voltage as when received, indicating internal voltage regulators were working properly. Discharge test to determine storage capacity has not yet been performed, but I am well pleased with this purchase at this point in time and will likely reorder as needed.

They work great!!!

The batteries were delivered in a timely manner and they charged quickly. I like the LED light at the bottom of the batteries that let me know when they are fully charged. I intend to use these high capacity, low drain batteries in my smoke detectors.

Bought a 4 pack...2 never charged at all. The other 2 worked for a few hours in my smoke detectors. Planning on returning.