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Re: Dead battery!
Are you sure you were measuring it correctly? It seems impossible that it rapidly discharged like this. You would have to have noticed the robot slowing down and becoming weaker. It probably would have stopped running entirely before it got anywhere near .25V.
The discharge may have been caused by some sort of connection of the battery to the frame and consequently to this metal strip. A short like that may also explain the hot connector (caused by a large amount of current flowing through it caused by the short).
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