Nope, I meant 3C charge... I do it all the time with lithium packs and they never get even warm. Of course these packs are rated for 70C discharge so they are very low internal resistance packsNot sure if you meant 3A ?!
3C charge would typically mean 10-12A for an eBike. Even 1C would make it warm and 3C would definitely make it hot!
Just to give you a perspective. Tesla supercharger is close to 1C and the charging cable definitely gets hot!
3C on any ebike for a few seconds would be ok but not many batteries are designed for sustained 3C draw.
For others who are reading this: 3C = you are draining your fully charged battery in 20 minutes.