Thanks for the replies about charging and the power supply.
So I get that charging at the 1C rate is best. I will do that for now.
I will use this power supply for now since it can do fine with the 1C rate for one battery.
But a couple more questions....
How many 1300 3S 25C batteries (currently have three Gens Ace) can I do in parallel with my 10amp power supply at the 1C rate?
I'm guessing that I can lower the charge current for multiple batteries in parallel? And how low of a rate can you charge at for a Lipo?