It will probably work like combining the runics, so it wouldn't do anything with two 30's.
This is what makes me so annoyed with the game. Its a half fix. I mean, why limit it to 50 charges? Why not 500 charges or 1000?
Same for runics.
A DC hammer is 50 charges. You can combine up to 100 so thats 2 hammers. I have literally over 100 of them with bods to do another 200.
Why can't I combine into like 500 or 1000 charge hammers? Thats only 20 DC hammers.
And while you are at it - how about letting me combine charges of Powder of Fortification? 10 per vial. Let me make 500 charge vials. When I'm crafting I have to have a chest of those stupid things as each piece of armor requires 2+ vials. It can take 12 to make a suit or more. I want one with 500 charges. Less items in the DB. Less cluttered game. More fun gameplay instead of managing items.
I feel a slave to items.