I'll assume it's not a race pack anyway (otherwise, you wouldn't abuse it).

If you have time, charge it at a lower amp rate (1-3 amps). Makes it kinder on the battery.

Later, after you play it, maybe deep discharge it, and once every so often (maybe once in 10 charges), slow charge it overnight from a deeply discharged state (.4 amps, or C/10, even .3amps) for 12-15 hours.

I do a deep discharge once in a while (.9v per cell, or 5.4v for 6 cells) using only .5 amp discharge rate (AFTER the pack has been used in the car -- otherwise, it would take forever to discharge a pack).