I have a Futaba 9C with a 2500 NIMH battery pack. I can fly almost all day with it. I always charge the battery at 1.2 amps. It usually takes less than an hour to fully charge. Your charger must set to NIMH. My little wall chargers will not charge this pack as their output is too small per the instructions that came with the battery.

Note I quick charge all of my batteries - NICd and NIMH. But I watch the charging process pretty closely.

Several people at our cub use this 2500 mah battery in their 9Cs without any issues.

bob