Can you make your own battery pack?

Connected to HyperGear Power Bank:

~$ cat /sys/class/power_supply/tps6598x-source-psy-0-003f/uevent
POWER_SUPPLY_NAME=tps6598x-source-psy-0-003f
POWER_SUPPLY_TYPE=USB
POWER_SUPPLY_ONLINE=0
POWER_SUPPLY_PRESENT=0
POWER_SUPPLY_CURRENT_MAX=500000
POWER_SUPPLY_VOLTAGE_MAX=5000000

Not connected to HyperGear Power Bank:

~$ cat /sys/class/power_supply/tps6598x-source-psy-0-003f/uevent
POWER_SUPPLY_NAME=tps6598x-source-psy-0-003f
POWER_SUPPLY_TYPE=USB
POWER_SUPPLY_ONLINE=0
POWER_SUPPLY_PRESENT=0
POWER_SUPPLY_CURRENT_MAX=500000
POWER_SUPPLY_VOLTAGE_MAX=5000000

When plugged into electric outlet (power-off required to make charging LED illuminate; then power-on again. Due to this ongoing issue.):

~$ cat /sys/class/power_supply/tps6598x-source-psy-0-003f/uevent
POWER_SUPPLY_NAME=tps6598x-source-psy-0-003f
POWER_SUPPLY_TYPE=USB
POWER_SUPPLY_USB_TYPE=SDP DCP CDP C [PD]
POWER_SUPPLY_ONLINE=1
POWER_SUPPLY_PRESENT=1
POWER_SUPPLY_CURRENT_MAX=1500000
POWER_SUPPLY_VOLTAGE_MAX=12000000

Disconnected from electric outlet:

~$ cat /sys/class/power_supply/tps6598x-source-psy-0-003f/uevent
POWER_SUPPLY_NAME=tps6598x-source-psy-0-003f
POWER_SUPPLY_TYPE=USB
POWER_SUPPLY_USB_TYPE=SDP [DCP] CDP C PD
POWER_SUPPLY_ONLINE=0
POWER_SUPPLY_PRESENT=1
POWER_SUPPLY_CURRENT_MAX=1500000
POWER_SUPPLY_VOLTAGE_MAX=5000000

When connected to electric outlet, but without the aforementioned power-off-then power-on trick to force charging to start; no charging LED illuminated):

~$ cat /sys/class/power_supply/tps6598x-source-psy-0-003f/uevent
POWER_SUPPLY_NAME=tps6598x-source-psy-0-003f
POWER_SUPPLY_TYPE=USB
POWER_SUPPLY_USB_TYPE=SDP DCP CDP [C] PD
POWER_SUPPLY_ONLINE=1
POWER_SUPPLY_PRESENT=1
POWER_SUPPLY_CURRENT_MAX=3000000
POWER_SUPPLY_VOLTAGE_MAX=5000000

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