I purchased this model, on sale, through Amazon. Sweet deal. This DOES carry a lot of charge, but believe flawed in design. I was impressed by the lights and amount of power, but I've found that this "ON-OFF" button is a BAD idea. Especially when carrying in it's cloth carrier in a book bag. Too many times have I pulled this out of its case and found it to be dead. Just recharged this (takes about 8 hours for a full recharge) and threw it (OK ... placed it) into one of my inner backpack pockets. Pulled it out after a 4 hour flight, today, and found that it was, again, fully discharged. It'd bumped against another item in my backpack which had turned it on. ANYTHING pressed against this button for 2 secs and it's a "goner" when you pull it out to use. I've another, smaller, charger that has a sliding switch ... Not the coolest item in the bag ... BUT it NEVER gets accidentally bump started!
I purchased this model, on sale, through Amazon. Sweet deal. This DOES carry a lot of charge, but believe flawed in design. I was impressed by the lights and amount of power, but I've found that this "ON-OFF" button is a BAD idea. Especially when carrying in it's cloth carrier in a book bag. Too many times have I pulled this out of its case and found it to be dead. Just recharged this (takes about 8 hours for a full recharge) and threw it (OK... placed it) into one of my inner backpack pockets. Pulled it out after a 4 hour flight, today, and found that it was, again, fully discharged. It'd bumped against another item in my backpack which had turned it on. ANYTHING pressed against this button for 2 secs and it's a "goner" when you pull it out to use. I've another, smaller, charger that has a sliding switch... Not the coolest item in the bag... BUT it NEVER gets accidentally bump started!