This definitely has an impact, because it charges for more than 12 hours it will overcharge, overcharge will actually cause excessive discharge of the electrolyte, so it has an impact on the life of the battery, which will cause the capacity of the battery to decline, and the customized life may only be used for one or two years.
The tablet is not too big a problem, because after the tablet is fully charged, the system automatically cuts off power, which will not cause any problems to the battery of the tablet.
No impact, this is just a function, does not increase power consumption and risk, if there is a need to turn on, do not need to turn off.