| 摘要 |
A battery pack, including a bare cell, a protection circuit board electrically connected to the bare cell, the protection circuit board including a checking unit to check whether the protection circuit board is operational, an upper case disposed on an upper side of the bare cell, the upper case having a checking hole defined therein to check the protection circuit board, the checking hole being formed to be opened to the checking unit, and a water penetration sensor, combined with an exterior of the checking hole, to cover the checking hole.
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