Heltec CubeCell - part 2

[bluejedi]

@Uskompuf

I understand the battery should be a 3.7V SH1.25-2 LiPo

I don’t directly have answer for capacity but ‘SH’ connector is incorrect. See this post for more info:

Heltec CubeCell - part 2

No need to apologize. I missed the 1.25 mm in the battery’s description. The CubeCell HTCC-AB01 indeed uses a 2-pin connector with 1.25 mm spacing for the battery. But Heltec’s product information is incorrect in calling this a ‘SH’ connector! JST Connectors ‘XH’, ‘PH’, ‘ZH’, ‘GH’ and ‘SH’ connector designations come from JST connectors. JST type connectors are manufactured to the design standards originally developed by J.S.T. Mfg. Co. (Japan Solderless Terminal). The following are popu…

Also take care to put a diode between the solar panel and the board:

Heltec CubeCell - part 1

I’m trying to understand the missing pieces of the ‘Power management system’ part in the HTCC-AB01 diagram to find out how to properly connect power to the board (and how not) in order not to damage it. There are Vusb, Vin, Vs(olar), VDD and Vext and their relation and what can and cannot be connected at the same time does not become clear from the circuit diagram (because parts are missing). E.g. is it safe to connect USB and Vin at the same time?, is it safe to connect USB and a solar panel a…