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Originally Posted by Ianworld
As was mentioned above, batteries get hot when there is too much current going through them. A bad test for this would be to connect the to terminals together.
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YIKES! Dont do that, the battery could burst violently spraying acid jell everywhere.
If the battery itself is getting hot then you are drawing a lot of current through it. Is there any place where the battery wires go through the frame, or a hole in a metal plate, where the wires might be shorting to the frame? That would suck your battery dead in a manner of minutes, and it might only happen when the robot is moving around, or some part of the frame/drivetrain... is moved a certain way?