Patent ID: 8563163

Claim:
A tool battery comprising: a battery housing; a hook disposed within the battery housing configured to lock the battery housing against a tool body of a power tool; a hook accommodation chamber defined within the battery housing and accommodating the hook such that the hook can move between a lock position for locking the battery housing against the tool body and a lock release position for releasing the battery housing from being locked against the tool body; a battery cell accommodation chamber defined within the battery housing for accommodating battery cells; and a first partitioning device partitioning between the hook accommodation chamber and the battery cell accommodation chamber, so that when water enters the hook accommodation chamber, water is prevented from entering further into the battery cell accommodation chamber; wherein a discharge hole is formed in a bottom portion of the hook accommodation chamber, so that water entering the hook accommodation chamber is discharged from the hook accommodation chamber via the discharge hole, and wherein the bottom portion of the hook accommodation chamber is arranged such that the hook moves toward the bottom portion when moving to the lock release position.