Our team is planing on building a tennis ball shooting robot for our host organization. It is going to have to go through camping conditions, dirt, mud, sand, and alital bit of water
. It will have people with limited to no robotics experience operate and maintain it.
I want it to have a super simple electronics and battery interface so that it can be charged/change batteries super easily. It also needs to have fail safes because it will be in operation near kids and were trying to incourage them to join our team, not fear us.
Could you tell me any of your suggestions?
Consider that the 12V from your robot isn't any different from the 12V from your car's cigarette lighter. (Err... sorry... that's "power port" these days, thank goodness.) - dtengineering [more] 
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