These are direct replacement batteries for anything that has the Molex Picoblade 2 pin connector on it. These are shaped a little different than most square or rectangle shaped Lipo batteries. These are long and skinny compared to most and may not fit in all battery compartments and you may need to do a mod, use velcro or use a strap to keep these in or use them depending on your setup. These also don't have a wire and the connector is right on the end of the battery which may also cause a problem if your device doesn't have enough of a wire lead to reach the battery connector.
These definitely increase your flying time when replacing the standard battery that came with my Makerfire RTF Micro FPV Lite Quad Tiny Whoop Based on Eachine E010. I went from 7-8 minutes of flight time to about 12 depending on if I am using the FPV camera or not on it. It also increased the power and punch to this tiny little drone.
With seven batteries now (6 new plus the original) I get all kinds of flying time now with out much break. I do have to let the motors cool a few minutes in between each battery just so I don't burn them up faster with all this extra flying time now.
If you need or want more batteries, these batteries by Tenergy are a great buy for the price. These and the others they make are all top quality and work great.
My rating on these: 5 Stars
Can be found on Amazon at:
https://www.amazon.com/dp/B074BNYV64
