A Maverick with a test box with too blurry resolution to properly discern writing like 'PHEV' or maybe 'FHEV' (Full Hybrid Electric Vehicle, which the regular Hybrid is considered) was spotted. No accounting for number of batteries, etc. If anything an additional battery would be very unusual. I don't know of any that break up the HVB into multiple assemblies.Remeber that a Plug in hybrid Mavrick with a second battery has been spotted being tested.
I actually wouldn't be surprised if it was just an emissions test mule for the Tremor. Another spotted at that time (early June 2022) touted as a potential 'AWD Hybrid prototype' clearly has what we now can recognize as a camouflaged Tremor lower valence.
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