Batteries

[TheOldPresbyope]

Code:

...
[   30.397058] Under-voltage detected! (0x00050005)
[   34.557113] Voltage normalised (0x00000000)
[   55.357316] Under-voltage detected! (0x00050005)
[   59.517110] Voltage normalised (0x00000000)
[  342.392624] rpi_firmware_get_throttled: 1 callbacks suppressed
[  342.392633] Under-voltage detected! (0x00050005)
[  346.552599] rpi_firmware_get_throttled: 1 callbacks suppressed
[  346.552606] Voltage normalised (0x00000000)
[  487.991461] Under-voltage detected! (0x00050005)
[  494.231161] Voltage normalised (0x00000000)
[  731.352489] Under-voltage detected! (0x00050005)
[  735.512505] Voltage normalised (0x00000000)
[  781.272257] Under-voltage detected! (0x00050005)
[  787.512229] Voltage normalised (0x00000000)
[  804.152142] Under-voltage detected! (0x00050005)
[  808.312038] Voltage normalised (0x00000000)
[ 1087.029838] rpi_firmware_get_throttled: 1 callbacks suppressed
[ 1087.029847] Under-voltage detected! (0x00050005)
[ 1091.189805] rpi_firmware_get_throttled: 1 callbacks suppressed
[ 1091.189813] Voltage normalised (0x00000000)
[ 1134.869409] Under-voltage detected! (0x00050005)
[ 1141.109256] Voltage normalised (0x00000000)
...

For sure the RPi isn't happy with its power source. I'd be surprised if an up-to-date moOde install would change this but I've been known to be wrong before

In addition to the usual voltage/current numbers published for rechargeable batteries, one has to know the battery is a "stiff" power source, e.g., the voltage doesn't droop with high current draw. Some are; some aren't. 

Then there's the USB cable between the battery and the RPi. It should be short and have adequately sized conductors so the voltage drop with high current draw is manageable.

Regards,
Kent