If the hybrid battery dies and you do nothing, the car will start and run but intermittently not charge the 12v battery, leaving you stranded now and then. The "fix" is easy enough, unplug the connectors from the computers in the back of the car and it will be a super reliable non-hybrid, albeit with a check engine light.
The CEL can be disabled with a relatively easy Arduino mod.
Can't say I'd want to drive anything in an Arizona summer without A/C.
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