Replaceable rechargeable battery unit for a power tool, power tool, and charger

A battery unit being rechargeable and replaceably connected to a power tool, comprising at least one coupling unit (12a) for charging said battery unit while said battery unit is being replaceably connected to the power tool, the at least one coupling unit (12a) remaining directly accessible while said battery is being charged.

A charger for charging at least one battery unit being rechargeable and replaceably connected to a power tool, comprising at least one first coupling unit (26, 28) for charging the battery unit,

• wherein the at least one battery unit has at least one second coupling unit (12a) making contact with the at least one first coupling unit and is being in at least one of a first charging state and a second charging state, in the first charging state the at least one battery unit being removed from the power tool while the at least one battery unit is being charged via the first coupling unit (26), in the second charging state the at least one battery unit being connected to the power tool while the at least one battery unit is being charged via the first coupling unit (28), and
• wherein the at least one second coupling unit (12a) remains directly accessible during the second charging state.

A power tool receiving a battery unit being rechargeable and replaceable, comprising:

• a receptacle region for connecting to the battery unit;
• and
• a coupling unit (16) located on said power tool and provided for charging said battery unit, the coupling unit (16) remaining directly accessible while the battery unit is being charged by a charger having at least a first receptacle region (34) and a second receptacle region (30) and while the power tool is being received in the receptacle region (34).