Review on 5-Pack EBL 9V Rechargeable Lithium Ion Batteries With 600MAh Capacity And 5-Bay Charger For Smoke Alarm Detectors - 2A Input by Marco Carpenter

I am a musician and I ordered these for my guitar and my wireless mic. The set up on these is very easy. They charge fairly quickly. I thought they would be perfect to use a fresh battery for each gig so I could save money on regular 9V batteries. I've used them 6 times and 3 of those times they stopped working in the middle of my gig. They were fully charged when I put them in the guitar/mic. When they stop, there is no warning. The instrument or mic just stops working altogether. I am very disappointed in these.update: 4/14/20 The Company seems to have very good customer service. They contacted me multiple times asking if they could send another set of batteries to try. They arrived very quickly.I will not be able to try these until the virus resolves and I'm performing again. Will update again at that time.