20170327: I bought 3 of these last year, early purchases for Christmas. I started using one myself, and left the other two in their box in the closet waiting for Christmas. Mine worked great, and continues to work well. The other two are also working well, even though I left them several months. When they were opened at Christmas, they still had a full charge. My daughter uses her unit more than anyone, and it is still working well. Mine has been in service longest, and still works well. My wife's gets used the least, so it sits around charged and rarely has any load. All 3 units are still in good condition, and still working properly. These things can charge an iPhone 6+ and still have plenty of juice left. Nothing but good experience with all three units.



20170502: update. All three units still working well. I now have another use for them, which is recharging photography batteries when I'm out and about. A lot of the batteries come with car chargers but some don't, and sometimes the car just isn't close. These bluesim chargers work great for recharging camcorders and SLRs.