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@gbj_tester
Take a 1.5V cell of 1Ah capacity (e.g. a cheap NiCd C-cell)
Total energy E added to charge from dead to full = 1.5Wh = 5400J
E=mc²
so mass change is E/c² = 5400/3E8² = 5400/9E16 = 6E-14kg