Millerr, charge rates of 1C are a definite plus for battery longevity.
Battery pack capacity will have a lot to do with life expectancy in regards to discharge rates. Don't forget, a 2600 mah pack trying to provide a full 35 amps to this motor running flat out is discharging at a rate of 13.5C. Likewise a larger cap battery such as a 3200 pack is discharging at 10.9C. It simply means that the smaller pack is working harder to provide the current at all throttle settings. Which brings to point the stated "C" ratings on battery packs. There is a lot of discussion around this subject and the consensus I get from all that discussion is to be very wary of stated C ratings, especially with lower end packs. That thread link I provided goes into great depth about this particular topic. Well worth the time to sift through it if the subject matter interests you.
While on the subject of battery packs and charging etc, I just added a Power Lab 6 from Revolectrix to my tool kit this year, and am most impressed with this chargers performance. Anybody contemplating a new charger, I would recommend checking into these. Tons of power, I can easily charge 6 of my 4 cell 3200's in parallel at one time at a rate of 1C if I had a big enough DC power supply to provide the input amps and voltage. Great diagnostics too, with a USB link one can monitor a lot of the charging data in graphs.