I agree poor usage regimes can certainly ruin a lead/acid battery, and in as little as 6 months or so. The comments you made though concerned Lithium batteries. Hopefully their longevity will improve but my experience with the smaller ones used in phones, laptops and vacuum cleaners confirms what I've read, that being that a Li-Ion battery can loose up to 40% of its capacity in the first year. Where they do excel though is in charge and discharge rates which can exceed lead/acid by a factor of 100 or more.
