Battery suitable for Ecovacs DN621 - 2600 mAh 14.4 V battery (Blue) - BatteryUpgrade
Alkaline Batteries | Panasonic Industrial Devices
Lithium Ion Polymer Battery - 3.7v 100mAh : ID 1570 : $5.95 : Adafruit Industries, Unique & fun DIY electronics and kits
3.7V Lithium Battery Charger Protection Board 5V 1A 2A Li ion Lipo Battery Charging Protect Two in one Module Micro USB Type C|module 5v|module boardmodule charger - AliExpress
Lithium Ion Polymer Battery - 3.7v 350mAh : ID 2750 : $6.95 : Adafruit Industries, Unique & fun DIY electronics and kits