Maybe the OP was concerned with keeping the lipos stored at higher voltages. Supposedly, it shortens the lifespan and may even puff the lipo causing internal damage when stored for long periods of time over 3.85V / cell. Capacity greatly diminishes over time when storing lipos at higher voltages. I remember reading that a lipo stored at 3.85V per cell diminished in capacity 3-4% / year whereas a lipo stored at higher voltages 4-4.20V diminished at 20% capacity / year. Personally, I always discharge any lipo (receiver pack or main pack) down to 3.85V / cell after I'm done for the day. I run my gassers every other week or so in the summer time. Before I go out to run for the day, I plug my wall wart lipo charger into the receiver pack and it takes 15min or so to recharge my 1500mah pack. Seriously, if people have time to muck about with mixing gas/oil and pouring it into the fuel tank, they can plug a battery in for 15 min. I always see people complaining online about how they can't stuff a larger receiver pack into a battery box. I really don't understand why anyone would need a larger battery. Are people that lazy that they can't quickly charge up the battery every time or every other time? IMO, you don't need a battery over 2000mah. I can run through 3 tanks of gas on my Baja using an 1100mah lipo and still have over 3.7V/cell.
BTW, I noticed a lot of gasser guys run their lipo receiver packs down till they're dead. This is REALLY bad. Not only does it damage the battery, but there's a known risk of lipo fires when you over discharge a lipo. Lipo fire + gas RC Car = even bigger fire! You should check your voltages often. Make sure they don't drop below 3.7V/cell resting voltage.
To answer your original question, a smaller capacity battery definitely makes more sense. Then you don't have to worry about storage voltages and just charge it up a bit every time before you run it.
