Battery gu ru's can tell you better. But I've dead shorted GP's and the old pack's seem to come back to life. Of coarse we probably couldn't stand to read the facts about it in the technical term's, but shorting is risky, you have to be sure of what your doing.
A hearty battery can take it. The 3700 GP's where the last I tried. the 38's and 42's tend to want to vent and poof that battery is shot. I'd say lower charge rate's and discharging to .90 per cell. And your pack's will last longer. Dead shorting short en's the life of the pack. But hey, Go fast and try not to crash.
OH: And I used to deadshort mine for a week from race day to race day.