If you search on Amazon for something like this, you should be good.

“MakerFocus 4pcs 3.7V 1100mAh Lithium Rechargeable Battery 1S 1C LiPo Battery with Protection Board, Insulated Rubber Tape and Micro JST 1.25 Plug for Ar duino Nodemcu ESP32 Development Board”

⚡️Every Meshtastic device I’ve tested so dar that could use a removable battery has come with the correct battery connection that you could easily diy splice onto a battery if the battery comes with the wrong one.  Just make sure to get positive and negative wired correctly.⚡️