When I see an advertisement like "lasts up to 6 hours" I do actually expect the item to last at least close to that. I bought a pair of these figuring 5 - 6 hours was perfect... in reality, the battery life is closer to 3 hours. When I emailed them about it, it was explained to me that the shoes actually last up to 3 hours, with the possibility of lasting up to 6... how? I have no clue, but mine don't come close. I've had these shoes for less than two months and they're gently used. They offered to sell me new shoe batteries for 20 bucks, I passed.Other than that, the shoes are comfortable and pretty solid. I've had no issues with the lights so far and I really like them. It's just a shame they don't last very long.