Up to 20A charge rate?

[Urgeoner]

Hello, I just got a EOS0720iNet charger claiming charge rates up to 20 amps, and I have the Hyperion G3 batteries that can be safely charged at 5c. But the charger won't let me go past 10 amps on lipo,(2c) but it will let me go past 10 amps on nimh batteries.. Is there any way to get the charger to charge the lipos at 4c (20Amps)? That's the maximum the charger can do.
I'm using Hyperion G3 7.4v 5000mah G3 lipos, so 4c will be 20 Amps.
*Nevermind it says that it limits Lipo charge rates to 2c. Why make a battery that can handle a 5c charge rate safely then?
Also, I'm lookin around for some rechargeable AA batteries...any recommends there?