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Here's my solution to flat batteries. I got a 4xAA battery pack from the local electronics store and voltage regulator and bits to make a voltage regulated supply. At room temperature it puts out 3.00V. If I put it into the freezer for an hour or so, it outputs 2.98V. The batteries have a much higher capacity than AAAs and they need to drop to about 4.2 volts before the regulator will "drop out". The hardest thing was taking to the laser with a hacksaw to cut it down and gain direct access to the circuit board inside.
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