I used my balancing charger to charge the 2600mah Li-ion battery from the original question and it finished after 1.5 hours.

After charging, I read 8.5V without a load and 7.45V with a 1amp load. This is well above my new 7.0V NO FLY voltage with a 1amp load, so I should be able to fly several 10 minute flights in a day without going down to 7.0 but I'll check between flights to make sure, then charge before each flying day.