Guru
Joined: 17/05/2016
Location: United StatesPosts: 3799
| Posted: 01:43pm 11 Sep 2021 |
The 18650 "battery shield" items are nifty devices, but the problem I've seen with them is that if your mains power goes off and the battery itself runs down, then it won't start back up if your load power is significant.
If you disconnect the load, then the battery will charge up and then you can reconnect the load. I've resolved this problem by connecting a diode between the 5V mains usb connector and the 5V USB out connector. That's if your load is connected to the USB socket. If you have a 3V3 load, I'm not sure what you would do to solve this problem.