nice emergency power charger. uses a lot of juice though, so need to recharge after use. a bit bulky as well. But still great

Couldn't find a credit card size battery so decided to try this tho hesitant. Altho heavier, turned out to still be good: actually easier to charge iphone on the go without having to hold onto it, esp using neck cord. Wished the cord didn't stick out and had usb plug.