TTGO T-OI ESP8266 Rechargeable Battery Holder Development Board with 16340 Chip, T-OI ESP8266 Development Board

Characteristics
1. Added 16340 power socket to the ordinary development board, which can use the corresponding 16340 rechargeable battery to power the system, which is convenient, beautiful and practical.
2. The product is compact and the size design extends the size design of this battery holder.
3. All IO ports are reserved on both sides, compatible with the distance between mini D1 extended version and breadboard. Grove interface is reserved at the same time, compatible with Grove interface module and T-Watch sensor module (T-watch special connection cable must be connected).
4. We will design more convenient expansion modules to match the motherboard to facilitate the realization of various ideas for students.

Hardware specifications.
1. Chipset: ESP8266EX
2. USB to TTL: CH340KK
3. Charging chip: TP4054
4. Flash: 4 MB
5. Size: 43.96x25.63x20.80mm
6. Weight: 7.87 g

Power supply
1. Battery: 16340 3.7V Rechargeable Lithium Battery (Not included)
2. Battery switch: yes
3. USB: micro USB

Wifi
1. External antenna mount: with ipex antenna mount
2. WiFi antenna: ceramic antenna