[cwalv]

Being able to charge it while in use might extend the life of the mouse past the life of the battery

[tonyedgecombe]

The fact that you only need to charge it once a month indicates the battery isn't going through many cycles. I expect the battery to last a very long time.

[Ringz]

@Cwalv is still right. Especially if you value sustainability higher than the manufacturer's share price. And you should always do that.