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@Gordon
No, only if D28 is pulled high. If floating it's fine.
If it's just the LDR I'd maybe see what happens with a fresh battery for now. I'd take the battery percentage reading with a grain of salt - it's not super accurate since the voltage changes with temperature (and the make of battery!).
You're definitely running firmware 2v09? With the Puck and LDR I seem to recall I got at least 3 months out of it. Potentially you could even look at adding a rechargeable battery and solar cell.
Something like a single LiFePo4 or 2x NiMh batteries would be great. There's so little power drawn than even a small solar cell would easily keep it going forever