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# Emisar D3AA
This driver measures battery strength when power is connected, and uses that
info to set a hard limit on brightness when the battery is too weak to handle
full power.
The number of blinks at power-connect indicates the battery type and strength:
- 1 blink: Strong Li-ion cell, full power enabled
- 2 blinks: Strong AA cell, max AA power enabled
(not used, strong AA uses mode 1 with full power enabled)
- 3 blinks: Weak battery, power severely limited
The 2-blink mode is not actually used. So it should blink 1 time or 3 times,
depending on the cell strength.
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