Segway PT i2 Getting Started Manual page 62

WARNING!
Never restart and ride your Segway PT after it has indicated an
empty Battery condition or performed Safety Shutdown due to
low Battery. The Segway PT may not have enough power to
keep you balanced, especially if you demand a lot of power at
once. If you restart and continue riding, you risk falling. Also,
you risk damaging your Batteries, resulting in reduced Battery
life and capacity.
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