Unexpectedly running out of juice on your phone can be a deeply irritating experience, which is why Doblet wants to place portable battery packs in popular restaurants and bars. The idea is if you pay an annual fee you can use the backup chargers. This will certainly come in handy if your battery draining catches you unaware while you are out at one of the specified locations.
However, whether someone will choose to pay for this kind of smartphone insurance is questionable. Many people with poorly functioning batteries already have a backup charger handy and with coffee chains like Starbucks hoping to institute phone charging mats rather for free, it's difficult to see why someone would choose to pay for this service. On the other hand, the peace of mind resulting from the portable battery packs can't be denied.