I have several Raspberry Pis that run 24/7 and one fails every time the power goes out for a second or more. I figured the solution would be as simple as connecting the AC adapter to the battery and plugging the AC adapter into the Pi. The problem is that most power banks I've tried don't have pass-through charging and can also interrupt the power supply to the load when the charger is switched on or off. I'm sure there are solutions using an external battery, but I haven't found any. However, I am satisfied with this board and the lithium cell. I was running a Pi 3 B with a 3.5" Nexium screen using the included 4000mah battery and after 2 hours the board was still showing 3 out of 4 battery lights with the input power off. It charged the battery after I applied power. I've also tried it on a Pi 4 B and a Pi 3 B with radio, the board handles them all with no problem. indicates the battery is charging, but the blinking only stops when you turn off the load or unplug. It doesn't seem to differentiate between supply current for the battery and supply current for the load. Hence it flashes 24/7 because I have a load connected 24/7. After a while it stays on continuously when I disconnect the load. I just prefer that it stops flashing after the battery is charged, regardless of whether I'm running a load at the same time or not. Mine came with zero documentation in the box other than text on the board. and documentation linked in the Product Description provided here on Revain. The English in the documentation is a little different, but it can be understood.
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