I have a project that the form factor of 18650 batteries works well for. The board I'm using is a esp32 based board with built in battery charging: https://www.amazon.com/gp/product/B072HBW53G/ref=ppx_yo_dt_b_asin_title_o00_s02?ie=UTF8&psc=1
- I've heard that the flatpack type Lithium Polymer batteries have built in over charge circuitry. Is this generally true?
- Can I directly charge a 18650 battery from Arduino type boards that have built in battery charging functionality?
EDIT: So from looking at the battery circuit schematic from the Wemos link and the board itself it uses a TP4054 "Standalone Linear Li-lon Battery Charger with Thermal Regulation in SOT". And since I can confirm the board works with 3.7V batteries and my 18650 is a 3.7V type I think I'm good.
EDIT: Found info on this board: http://www.raspberrypiwiki.com/index.php/WEMOS_ESP32_Board_with_OLED
Also by "Arduino type" boards I mean any popular micro controller board that has a battery charging function such as the Adafruit feather boards.
EDIT: To clarify: Reading here Li Poly and Li Ion batteries are essentially the same https://scottiestech.info/2015/06/21/lithium-polymer-vs-lithium-ion-batteries-whats-the-deal/
I believe the board is a Wemos D32 with an attached display though I can't find any specific info on this exact board. https://wiki.wemos.cc/products:d32:d32#technical_specs
I basically want to know if I can charge a Lithium Ion battery with this type of board. As this is potentially a safety concern I wanted to ask some experts.