| 摘要 |
A battery pack for an electric tool storing a plurality of battery cells each having identical size, but size of the battery cell can be selected among a plurality of sizes. In a battery pack, a plurality of battery cells is packaged by a separator in at least two stages or tier. The battery case includes an upper case and a complementary lower case to define an internal space in which a board holder holding a circuit board is disposed. The board holder has first and second retainers fittable with an outer peripheral part of small size battery cell packaged by a first separator and an outer peripheral part of large size battery cell packaged by a second separator, respectively.
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