I have a Sonicare toothbrush which has Lithium-ion battery and a body hair trimmer that has a NiMH battery.
I have charged the Sonicare once or twice without ever using it, just to stop it go to 0% even though I am not completely sure if that is true. The trimmer is unboxed, for over a year now so I have never charged it and/or used it since it left the factory.
I know that the Lithium-ion are better for such conditions, but I don't know the details. Does the type of storage, temperature and such affect the battery? On what way does it really affect it? Does it matter that I have never once used the device, so is it different if I used the toothbrush to check it out a few times (like 4) while the other one just sits in a box. And should I always choose the device that has a Lithium-ion batteries over the NiMH? Should I periodically charge them if I plan on not using them? Lastly can a Lithium or NiMH the battery destroy the device just from sitting in it?