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Meybe add small solar panel
AND additionaty stepup down for AA 1.5V or other power source
for example from 1V to 5V, any 18650 3.7V or other problem (in emergency situation)
for example having usb but other socket, or get battery from flashlight
Meybe add small solar panel
AND additionaty stepup down for AA 1.5V or other power source
for example from 1V to 5V, any 18650 3.7V or other problem (in emergency situation)
for example having usb but other socket, or get battery from flashlight