Segway x2 SE - Page 93

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SurfaceCharge(PartialCharge)
Whenever you do not fully charge the PT’s Batteries, surface charge or partial charge may affect the accuracy of the Battery charge level display,
causing it to show a higher charge level than actually exists.
After you power on, check the Battery charge level display and then ride for at least three or four minutes and check the Battery charge level
display again. If the Battery charge level display shows rapid charge depletion during this time, the Batteries have received only a surface charge.
If necessary, plug the PT back in and recharge.