I once charged my DR800S to 100% and left it in standby mode. Never switched it on in two weeks. After two weeks it was still possible to switch it on - the battery was low, around 10% I think, but still the reader was operational.
Could that be that:
- the battery was not completely charged?
- the reader malfunctioned in Stanby, say it was not in Standby but in On mode?
I would try to charge it to 100% and leave it in standby for some time. Probably would switch it on once a day to monitor the battery state.
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