You need to get with someone who knows transfer cases. Some 4wd do not spin the front parts unless its shifted. Otherwise spin the front drive shaft, however there is a segment in the front axle that is operated by vacuum or serve to complete the connection. Sounds like you want it to always be in 4wd, Im sure thats something easy to change inside the transfer case so you dont need to make any holes in the cab for levers or rig up any wiring.
Not sure why the battery has to be removable? Lipo4 can be charged very aggressively unless you were going to take the pack in and charge it under your desk so to speak.
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