the wide tolerance option was added to keep with honeywell
the regs are very tight, too tight imo to the point of it not working without a bit of grey.
I once built a filter to cut everything below 75Hz on a car audio system might be an option
http://www.diyaudioandvideo.com/Tables/ButterworthCrossover/1stOrder/
Id expect that running on its battery for 20 hours it has gone completly flat and may have damaged it depending on its state to start with.
I dont know that panel but lcd looks a bit dim.
Id disconnect the battery to start with and meter your power outputs