There was a delightful feature in the discontinued Flip™ video cameras. The standard internal battery could be recharged over USB, but it could also be removed

There was a delightful feature in the discontinued Flip™ video cameras. The standard internal battery could be recharged over USB, but it could also be removed completely and replaced with standard AA batteries. The device remains usable even though the manufacturer went out of business years ago. Xbox controllers do something similar; I love being able to just swap them out from my box of rechargeable batteries without having to worry about if I left the device plugged in to charge recently.