The maximum capacity of the battery will naturally decrease with time and usage. (store.hp.com)
A big part of this, of course, is the sheer capacity of the battery. (pocket-lint.com)
He calculates that storing the output of just his local utility company, Nova Scotia Power, for 24 hours would take the energy storage capacity of every battery made worldwide this year — and then half as much again. (newscientist.com)