abnormal battery drain you say
It may be possible that during shipping a few wires got shaken up and you have a minor short. It may not be a large one with no load, but as soon as you bring a load on the wires, the current increases as does the current now going through that "possible" short. Just give your bot a once over, if you have a larger charger one that has the higher starting capabilities use that as a battery eliminator on the bench to see if you experience the same voltage drop and current draw.
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