3.7V 522332 400mAh Lipo battery Rechargeable Lithium Polymer ion Battery Pack with PH2.0mm JST Connector

The charging case for my earbuds had an internal battery that gave up. So I cracked the case open and got the number off the battery pack. So I went on Amazon and entered the number that I found on the old battery pack. so I bought this battery and cut the wires to my old battery and twisted this one in. So now my earbuds are working just fine.

Works greatUsed it in 3 year old bluetooth speaker. Original battery was held in place with adhesive used contractors tape to hold new battery in place. Soldered then heat shrinked old plug and wires to new battery as it had different size plug same voltage and miliamp hour rating works great.Can't say for sure if it's better than new as I never timed how long original battery would last but does work as intended battery indicator works to show low battery, charging, and charged.

Connections are backwards. Seller should show a larger image and warn customers

Could not return.

I bought this battery for replacement of my smartwatch battery. The battery worked well but it is not lasting as long as the original one that I had in my smartwatch.

I used this to replace the battery in my aqua sound shower BT speaker. It just snapped in and it works like a charm. I'm very happy with this product. I love that speaker and I've had it for years. I'm just glad Amazon could come through for me again and had exactly what I needed.

Used to repair dashcam, measurements were more a guidance than a solid measurement. Came charged to 60%. Polarity was correct for the battery I received, checked immediately as soon as I received it. Would buy again. Lets see if it will last an Arizona Summer in a black car....... :-)

Both batteries had the wires reversed. I had to swap them. Aside from that they work well.