I'm no expert but...
4400mah battery
charge at 1C requires 4.4amps; charge at 2C (if allowed)requires 8.8amps.
so to charge two 4400mahs batteries at 2C requires 2x8.8 amps
equals a powers supply capable of 17.6amps to supply the charger.
This assumes the charger can also supply 8.8 amps to both charging ports at the same time.
You might be better getting two chargers!
Ian
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