If it is an X2, then there is a backup method for shutting down. The following is from the manual:
Quote:
Switch your PT to Standby Mode by walking beside it while holding the Handlebar until you hear the Stick Shake Warning and feel the
PT switch out of Balance Mode, into Standby Mode.
Leave your PT in a secure location for 15 minutes until it automatically powers down.
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I don't know of any backup method for 1st-gen models, presumably because you just hold down the built-in button to turn them off, so there isn't really much need for backup unless the software crashes, in which case a backup method probably wouldn't work anyway - then you just have to disconnect the cables or batteries.