Quote from Macworld.com review:
"Apple has said that the Magic Mouse 2 (along with the Magic Trackpad 2 and the Magic Keyboard) are fast-charging devices; the mouse can get nine hours’ worth of battery life in about two minutes. So, in the time it takes for you to visit the bathroom, stand up because your Apple Watch told you to, or go to the kitchen to grab a beverage, your drained Magic Mouse 2 will have a charge that will last a typical working day. Really, the charging port on the bottom of the mouse isn’t a problem—but sometimes people need any excuse to be outraged over Apple products. Apple’s press release says a fully charged battery can last “about a month or more.”
I think the charging port at the bottom is ok. That is the smallest of the problems with this mouse. The real problem is the horrendous ergonomics...