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

Works great, long life, easy to charge

Best rechargeable 9v battery I have had. Hold their charge for much longer than other brands. Great quality build. The 8 pack was the best value out there. I use these in smoke detectors since I have 8 in our home. The usb c charger is quick and great as you can charge 4 at a time.

did not use them yet

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.

Llegó bien.... Vinieron con algo de carga listo para usar

Best thing I ever bought and the charge last longer than regular batteries, great job

Cool product

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.

Does not hold any charge. Gets discharged in seconds not even a minute