1gram battery ≈ 47mAh;)
I have 5 batteries.
Motorola BK60 930mAh Weight - 20g.
Motorola BC50 750mAh Weight - 16g.
Sony Ericsson BST-33 950mAh Weight - 20g.
Samsung sgh x160 800mAh Weight - 17g.
HTC Desire HD 1230mAh Weight - 26g.
930/20=46,5
750/16=46,8
950/20=47,5...