Nope. I don't know of any PCC for the mega Kr8 battery.
The mega (aka XL) Kr8 battery will not fit inside the regular Kr8 PCC case. However, you can charge it with the PCC with the lid open. Kinda defeats its purpose, I know.
But you don't really need a PCC with that mega Kr8 battery. Since it is 380 mAh, if you leave the house with two fully charged
batteries, that 760 mAh should keep you going all day.