Battery charging for 2+ hours

[AfroP]

I have an overlander charger(cant remember the exact model number) but its an 80W balance charger.

When I balance charge my cells(no swelling or heat or anything from them) it takes forever.
last night for example they were charging for 2 hours and were sitting at 0.00a for at least 10 mins before i stopped it

if I use the fast charge they are charged withing 20-30 mins depending on how discharged they are from racing.

now is this because of my charger being a cheap crappy one or because my cells are borked?
i have 2 different packs and this happens to both of them with this charger so i'm leaning towards it being the charger that's at fault but wanted to get another opinion.