Segway PT x2 Reference Manual page 74

Do not use the Batteries if the casing is:
Broken
Emits an unusual odor or excessive heat
Leaks any substance.
Avoid contact with any substance seeping from the Batteries.
Keep Batteries out of reach of children and pets. Exposure to
Battery voltage could result in death or serious injury.
Unplug and disconnect your Segway PT from AC power before
removing or installing Batteries or performing any service. It is
hazardous to work on any part of your Segway PT when it is
plugged into AC power. You risk serious bodily injury from
electric shock as well as damage to your Segway PT.
The cells within the Batteries contain toxic substances. Do not
attempt to open Batteries. Do not insert any object into the
Batteries or use any device to pry at the Batteries casing. If
you insert an object into any of the Batteries' ports or
openings you could suffer electric shock, injury, burns, or
cause a fire. Attempting to open the Batteries casing will
damage the casing and could release toxic and harmful
substances.
Only charge the Batteries using charging devices approved by
Segway.
Comply with all local and federal and individual country laws
when disposing of and transporting the Segway PT Batteries.
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WARNING!