9 V Rechargeable Battery, 13500mWh 9 V High Capacity Lithium Batteries, with USB-C Fast Charging Cable, Ideal for Smoke Detectors, Microphone, Alarms, Toys, Torches, Medical Devices etc. (Pack of 2)

Used and re-charged both batteries in the pack several times, both work fine. Recharging is easy with a standard 5V plug. Cannot say yet how long they will last, but even if it were only 20 charging cycles each it would be a lot more cost-effective than once-use batteries. Recommended.

I play bass guitar with battery pickups and was getting through a lot of rechargeable 9v, saw these and really liked the how these are charged with their own USB and absolutely delighted with them. Although the USB area does take up a bit of the battery size as this slots into the south end of the battery they stay charged a long time equivalent to normal rechargeable 9v they also have the charging light to let you know what's happening. I would Definitely recommend.

Used these for an Arduino project and they are perfect. Easy to use and quick to charge. The only thing that could improve them is if they had a larger mAh.They should also be labelled in mAh rather than mWh. You have to divide the mWh by 9 to get mAh. Call me cynical but maybe they did this deliberately?

once you buy , you don't have to warry about battery any more, the charger is coming together which is a plus

Bought these to power a night light with LED strips for my son’s bedroom.This has been working fine with standard 9V alkaline batteries, but light dins as the battery fades.To reduce cost I thought these would be ideal.At first they looked great especially liked the USB charging cable.However after fully charging and using in the light it worked fine for a few hours but then the LEDS were flashing.So not impressed. Will try again but will probably return as these were not cheap.Also the stated capacity doesn’t seem to add up. Translate some of the German reviews to see why.

If like me, you play musical instruments outdoors with no access to mains power and you need a pedal or two, you will love these batteries.Some pedals really drink the juice out of the most powerful alkaline non rechargeable. I tried these in desperation and I can get a lot more time one one before it needs replacing. Being chargeable, not a cost issue, which it is on standard batteries.....

working great

Quick delivery, and just what I wanted