This battery pack from Lumsing is pretty interesting and also pretty cool. It's a harmonica style battery pack, that touts 10,400mAh of battery inside to charge up your devices. It does have 2 USB ports here to charge up your smartphone and tablet, or even two smartphones. It also uses 4 LED indicator lights to let you know how much juice is left. It's currently on sale right now for just $24.59. You can grab it from the link below.