A battery that has lost it's charge.
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It means the battery will operate a device for 8 hours before recharging is needed.
It charge faster
well, i don't really get your mean, if your lithium battery declines, you can replace it for a same capacity, working volt, and the part number.
Battery mass is not designed to deplete over time. However, some older and serviceable water filled lead batteries did require periodic fill. In these batteries the loss of water would affect mass. Modern and sealed batteries should and will not change in weight.
.... until all the hydrogen is depleted.