Hi, i have a question about dual cell mod and so on up the table. My question is do the batteries have to be the same mAh e.g. 100mAh + 100mAh or can they be diffrent e.g. 100mAh + 60mAh. I know this prob sounds stupid and think i am dumb but i am only young . so can you just take a minute and answer my easy question. thankyou very much.