@errolt
https://github.com/LilyGO/TTGO-ESP8266-0.91-SSD1306/blob/master/t12_8266_v1.3.pdf
The schematic is here

Hello @adam2809 , do you mean this one ? https://www.aliexpress.com/item/4000542688096.html

it can be charged via USB-C too , and both they (Solar/USB) can also charge the battery .
f08dfc1d-d410-4831-b88c-c46f43f38afe-image.png

Hello @reddai ,Thank you very much for your support .
We have several type epaper products, which one you used now ?
Currently we are more focused on hardware customization, or could you tell us more detail about the software you want?we can check for you first .
Here is our Github for reference if it is needed.

@Lilygo Hey could you please respond to my problem in thetechnical discussion page about location problems on the LilyGo T-Call SIM800?

@yakuzja There are two ways to get started quickly

Use the Arduino IDE and install the ESP32 support package. Use the VSCODE PIO plug-in, this plug-in can automatically configure the environment for you, the compilation speed is relatively fast, and it also supports Arduino functions and libraries

0248c48c-7c32-4a8f-a27f-0bd4c68d0d62-image.png

@ckuehnel ![alt text]![0_1630891882486_IMG_4333.JPG]
Hello, this is the battery wiring method for the extended backplate.The battery type is 3.7V lithium.
(Uploading 100%)