melasta 9V Rechargeable Battery High Capacity 600mAh Compatible with 6F22 PP3 MN1604 6LR61 with 2 in 1 USB Cable, 9V Li-ion Batteries Long Lasting All-Purpose for Smoke Detector Multimeter, Toys 4 PCS

Use these for guitar pedals and it’s very handy to be able to recharge them and see how much battery I have left on the fly. The seem to last pretty long too which is nice.

The batteries arrived with a voltage of 7.2 volts. I connected one battery to a 4 port charger, 5 volt 2.1a each port, with the supplied lead and a second battery to the same charger with my phone lead. After 4 hours charging both batteries tested at 7.2 volts. I then put both batteries into a mains powered charger. After 3 hours the charger told me that both batteries were charged. Both batteries tested at 8.4 volts.Conclusion. The batteries are good, I am using them in multi-meters. The on-board charger is a great idea but I think that further development is needed.The batteries may work for you. They did not work for me.

Way below 9V; way below 600mAh; not suitable for smoke alarm (one discharged in 2 months; another one within a week after full charge)

Purchased these based upon the statement that they are suitable for musical equipment. Didn’t work, despite trying all 8 batteries. Complete waste of time and money

I’ve been using them in cable test & locator tools that often get left on. Quick and easy to charge, last longer than needed

Got these for bite alarms... Coz I hate buying pp3, s.... Working great so far...

Great Item and Service

Poor