Depends which battery chemistry.
Pretty sure it only depends on the total energy stored in the battery, not the chemistry you use to achieve this, i.e. a 3V 2Ah Lithium cell contains as much extra mass when charged as a 1.5V 4Ah NiCd cell.
@gbj_tester started
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Pretty sure it only depends on the total energy stored in the battery, not the chemistry you use to achieve this, i.e. a 3V 2Ah Lithium cell contains as much extra mass when charged as a 1.5V 4Ah NiCd cell.