Do you remember when mobile phones had a battery life of about 4 days. Nice wasn't it? These days you are lucky to get 4 hours out of your iPhone or Samsung, no doubt because they can practically run NASA! As such, running out of juice is a common occurrence, particularly if you can't get near a plug or charger. If you plan ahead though, it can be avoided with these stylish and highly portable mini magic power banks. Once powered up fully from your mains at home, they can give up to two full recharges of a mobile.