Hmm, arrived today but I think I'll be sending it back. It's engraved as a kickstarter edition, and the battery seems completely hosed. Claims to have 70% charge even though it's been charging for hours, and immediately switches off if I unplug it.
aw, you were speaking of used items, I intentionally ignore used exactly due to that - battery is weak point and improper handling may just kill it. Even proper can - as I saw on my personal example :)