Adafruit INDUSTRIES 1578 Lithium Ion Polymer Battery - 3.7v 500mAh

I use this lipo battery with my Adafruit Feather HUZZAH with ESP8266 as a backup battery for a temp/humidity monitoring system for when the power is out. It works very well with other products too. The Feather Huzzah will keep the battery charged when power is available and automatically switch over. Adafruit products are well made by really smart and nice people and I never had a bad experience with any of their products. The online docs are very clear and complete.

Works in the hayward aqua pod. Just swap the plug end with the original and your good to go. Better than paying 700 bucks for a new one since they say it's a non replaceable battery.

I wanted to change the batteries of a bunch of motion detecting LED lights I bought whose lithium batteries were not lasting more than a week or so. These batteries were a bit larger and fit fine. The wall lights are made by OxyLED but are same as https://www.amazon.com/gp/product/B01M0T8TML. They hold the charge for a lot longer!

Used this to replace a battery in a Bluetooth shower speaker. I had to solder it in my application and didn't use the connector. Charged right up and speaker is working like new.

My TaoTronics TT-BH21 headphone battery failed right after the headphone warranty expired. Headphones still worked with charger cord connected but then became wired headphones.I wrote TaoTronics, asked how to get the headphones apart to access the battery-- no reply!! Took a chance and pried the ear piece apart to expose the battery, measured it's dimensions and found this one, a very close replacement.I stagger cut the wires off the original battery at the battery and likewise stagger cut the wires mid point on the new battery. Slid short pieces of heat shrink tubing over the wires, then soldered the connections. Finished with heat gun to shrink the tubing to cover the bare connections.Battery came nicely boxed and charged. No report on it's performance yet.