Originally Posted by
DrIsotope
I should point out that lifespan for the battery isn’t determined by age, but charge cycles.
spot on...this is why my old 500 was doing awesome for so long. Wasn't using it as much as I use my 520. My 500 seemed to last forever before the battery started to fail and the charging port got wanky. I don't expect that kind of life of my 520.