Battery pack and electric tool

A battery pack comprising a cell group including a plurality of cells which are all-solid-state batteries and which are electrically connected to each other,

• the cell group being
• a parallel series cell group including two or more parallel cell groups which are connected in series to each other and each of which includes, as the plurality of cells, three or more cells connected in parallel to each other or
• a series parallel cell group including three or more series cell groups which are connected in parallel to each other and each of which includes, as the plurality of cells, two or more cells connected in series to each other,
• in the cell group, a parallel number which is a number of the plurality of cells included in each of the two or more parallel cell groups or a number of the three or more series cell groups included in the series parallel cell group being greater than a series number which is a number of the plurality of cells included in each of the three or more series cell group or a number of the two or more parallel cell groups included in the parallel series cell group.