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I also looked for an answer to this question.
I didn't see anyone suggesting over 1C rate. It seems that 1C is the highest safe charge rate you can go.
I also asked if there was any benefit to charge them below 1C and didn't get any pozitive answer. However, it would be wise to use less than 1C for the first couple charges. It would be a good start for a new pack.
So unless the manual says differently, you can charge them at 1C rate.
My stock Evoflight pack is 1600mah but the manual strictly suggests max charge rate of 1.4amp, so I do what they say.
This statement cannot be true, then 5000mah pack would take 5 hours to charge. So say you got Fury Ion, then just forget about it.
I've heard never charge any LiPo over 1000Mah regardless of the rating