@fiddleshe, here is Mooch's battery charge current rates (from Oct. 2019).
View attachment 907613
For "Max Life" the 30Q should be charged at 0.75A.
The C4-12's don't have a 0.75A setting. They do have a setting for 0.8A which is close enough. Alternatively you could drop your charger down to 0.5A.
Good luck!