Bosch BSS8 Series Instruction Manual page 50

Li-ion batteries
When not in use, keep the battery away from paper clips, coins,
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keys, nails, screws and other small metal objects that may cause
the contacts to be bridged.
If a short circuit occurs between the battery contacts, this
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may result in burns or even fire.
If the battery is used incorrectly, liquid may leak out of the
„
battery. Avoid touching the liquid. In the event of accidental
contact, rinse the affected area with water. If the liquid comes
into contact with the eyes, seek medical assistance.
If battery liquid leaks, it can irritate or burn the skin.
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