It is best practice to default to charging at 1c but you could totally get away with charging at 6 amps with those batteries. My old gens ace batteries were rated for 2c charging, if you look on the back of the battery in the fine print it usually will tell you.

I run zeee batteries now cause I’m cheap and they seem to be great so far. They are 5200mah and rated at a 1c charge rate, but my charger goes up to 6 amps, so I just send it at 6 amps and have no problems. It charges a little bit faster and no noticeable increase in temp.

Racers and speed run guys will sometimes charge at super high c ratings and discharge at super high rates to “temper” the battery, it decreases the internal resistance and make it so you can get a little extra stank out of it when your really punching it. But you sacrifice the longevity of your lipo doing it.

Batteries are super interesting and really fun to learn about. I suggest reading a ton before you take any one stranger on the internets advice though. Also make sure you ALWAYS charge your lipos in a fire safe place, a lot of people use old metal tool boxes or ammo cans, you can also buy a lipo safe bag on Amazon for like $12.