I don't know about the motor and 48v. For starters, you'd need the controller to be able to do 48v. Most can on the bigger direct drive motors, but smalller 350 watt controllers may not have 63v caps in them.
BTW, these 10s packs are 36v nominal voltage. So the normal controllers would be fine, and the discharge capacity won't matter to the motor or controller. It won't put more amps through the motor than the controller allows. For 48v you'd need 14 or 15 s to have about 56-60v hot off the charger.
My rule of thumb for 36v bikes that go 25 mph is 1 ah per mile range. This rule means your 9 ah pack would go 9 miles, and still have about 15-20 % left in reserve. At 20 mph, you'd have plenty of range if the bike is not able to go 25 mph on 36v.
This would make a good setup for a 36v bike. You could run most motor kits easily on one pack, and then add packs later as range is needed. Since they would be paralelled, a 10s charger could still charge them all together, paralelled. You'd paralell connect the main wires, and paralell connect the balance taps, and then just connect them to the charger. Above 10s, then it would get more complicated.
THE LIPO RULES. NEVER ABOVE 4.3V NEVER BELOW 2.7V DON'T PUNCTURE
Ideal charging /discharging range for Lipo, 3.65v minimum 4.1v maximum
See battery technology section, FAQ thread at the top of the page for lipo noob info.