sej7278 wrote:huelvayork wrote:That seems a great idea. You can insert only one battery and use the other battery's place for your components.
I'm powering an ESP-01 from a power bank like this (but the one with only one battery), with battery inserted. It reaches 4.2v while charging the battery and the ESP01 is still alive.
huh? what kind of single rechargeable battery reaches 4.2v? even 18650, LiFePO4 or lipo won't do that, or do you mean the voltage coming from the usb socket (into the batteries) which should be more like 5v @ 500mA
Just google it
![Smile :)](./images/smilies/icon_e_smile.gif)
BTW My LiPo cells do follow this curve...