"No power bars" means "Pending empty battery condition".
Page 17 of the Reference Manual.
"In some cases, old, cold, heavily used, or poorly
maintained Battery Packs may develop a high resistance
condition, which could cause the Display to show the
pending empty battery condition even though the Battery
Packs were recently charged. Whenever you see the
pending empty battery condition icon in the Display, you
should come to a controlled stop and safely step off of the
Segway HT prior to commencement of the Safety
Shutdown."
See also information starting at Page 26.
http://www.segway.com/segway-resourc...nce_Manual.pdf