The trouble with SPOT is that it is both a tracking device that is used on a regular basis (= eats batteries each time you go somewhere, and rechargeable makes sense) as well as an emergency device (= lithium primaries makes sense).
It is hard to fullfil both roles at the same time.
Just for clarification, SPOT's tracking function is an optional service for which you must pay extra AND you must switch on that function if you choose to use it. Off the shelf and with the baseline service plan, there is no tracking functionality.
I think it may be possible, however, for an uninformed user to not buy the tracking service but try to turn on the tracking function. This may cause the unit to burn battery power transmitting tracking info despite the fact that the system isn't processing that info.
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