Nope.

You're using the Lipo formula for a nicad pack. Nicads have a quirk where if you charge at a higher rate, the pack voltage will be higher but you will lose run time. That's good for a race pack but not a receiver pack.

Charge the pack at 1 amp and you'll be fine. If you're at the track and you're in a rush you can charge at up to 2 amps with no issues.