Segway PT i2, Reference Manual

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Batteries
Figure 15 shows the location of the Batteries.
Figure 15. Location of Batteries
The two Batteries are sealed units (when properly installed) that
require no maintenance other than proper charging and storage. The
Batteries are interchangeable and can each be installed in either the
front or rear of the Powerbase. For the Segway PT to operate, both
Batteries must be installed, and both must be Li-ion Batteries. If one
Battery fails or is depleted beyond its safe limit, the Segway PT will
perform a Safety Shutdown.
For more information on Safety Shutdown, see “Safety
Shutdown” on page 55 .