The white LEDs in the Charliewatch were probably not the right choice - their forward voltage is 3.0V, so once the 2032 or 2450 battery draws down a little bit they dim and turn off, even though the CC430 CPU will run down to 1.8V.

@qrs you could have a little boost converter driven perhaps even by the micro, but it's too late now huh

@MightyPork I'll make another one with red or amber LEDs, which go down to 2V. Unfortunately the really pretty pink ones are also 3V.

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@qrs ah yeah pink is usually just white with a special filter

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