Rechargeable 9V Lithium USB Battery 860mAh with 4 in 1 Charge Cable, 9 Volt Batteries 6f22 for Smoke Detector Alarms (8 Pack)

Good value andWorks well. Easy to charge. So far battery life good

Simple to charge. I'm not sure how long the charge lasts compared to a single use battery, but I ran a small set of LED lights pretty much all day with one of them.

Genius, I was buying replacement 9V for my "Bark Off" not thinking really. When I finally thought of it I got me these. I love that it comes with 2 so I can have one charging when the other is in use. The battery life is about 1 month and doesn't feel cheep or expensive. It is light. I haven't dropped the battery to test durability but the quality is there. But one issue is that the battery just dies in the device rather than getting a low battery notification

The only issue that kept from giving 5-star review is the overall dimensions of these batteries. The width and height is approximately .6 to 1.0 mm larger than typical alkaline batteries. That's not much, I know, but on some devices (temperature gun, multimeter) the battery compartment has exact dimensions, and these batteries are a TIGHT FIT.

I was concerned that the voltage might be a little low as I experienced with other rechargeable 9v batteries. These work well. I think the charging cables are pretty cool. They are lighter than the typical 9v.

I plugged these into my usb phone charging port on my clock. The clock started flashing weird digital mis-displays? My clock totally fritzed. I didn't get them charged to try before returning.

These are great, easy to plug and charge. Hold a long charge. Green light indicates full charge.

Easy charging and seem well made, but generated a terrible noise using active pickups in my bass. If a had any other need for 9v I would have kept them, but i don't so they were returned