[Al Skierkiewicz]

I am not reading these forums as often as I would like to BUT never and I mean never tie two battery chargers in parallel. There are very limited circumstances when voltage sources can be tied in parallel and this is not one of them! Use devices as intended.
As to draining a battery in a single match, you are killing the battery to draw that much out in a short time. You are almost creating a dead short across the battery which everyone should know by now is a dangerous position to be in. If you were drawing this much energy from the battery and not tripping the main circuit breaker, the breaker was faulty or there was something else seriously wrong. This is one of the reasons that FIRST judges should be checking current draw on a powered robot during inspection. Were you burning motors as well?
Let me know,