This is actually a very well made flashing collar. Perfect for keeping your canine chum safe on dark nights. Not particularly waterproof though, but it could be the basis for a custom version.
The unit runs for hours on a charge even when in continuous mode, so it should last a very long time between charges in flashing mode. The charge current is 100mA so it should be near fully charged in an hour. The formula for the charge current is 1V divided by the programming resistor value then the result multiplied by 1000. So 1V divided by 10,000 ohms = 0.0001, multiplied by 1000 = 0.1A (100mA).
The lithium cell tested at around 88mAh. It may gain a bit more capacity after a few cycles, but was a bit lower than I guessed. With a bigger cell the PCB could be useful for a custom beacon.
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