Unless the Multi Mic is clever enough to bypass charging its battery while connected as you describe, this is not a good idea as it will get the Multi Mic battery at 100% charge (microcycling), probably heat the battery a bit to boot, and degrade the battery charge capacity (and therefore longterm battery lifespan) more rapidly than keeping the device at less than 100% charge and using a narrower charger/discharging range if feasible than the full capacity range of the battery (fine to use that occasionally if needed). If you don’t mind simply buying a new Multi Mic whenever needed and not worrying a whit about how you charge it, that’s obviously the simplest strategy. See this thread for further discussion of maximizing Li-ion battery lifespan. OEM’s love to sell you new devices. Apple is the source of some of the best battery care info and they can replace batteries in just about everything but the Apple Watch at a reasonable rate. The Phone Clip+ and the Multi Mic are “expendable” devices as ReSound says when their batteries are dead, you have to buy new. What is the expected battery lifetime of Phonak Roger Select? - #31 by jim_lewis