If the PE is a 12 volt unit like its big brother then there is NO way a 5 volt charger is going to have any effect on it.

To charge a 12 volt battery you need at least 13.5 volts. Most phones have a 3 volt battery so the 5 volt device will charge them without problems.

It is possible to charge a 12 volt battery from a lower voltage supply but it requires an electronic step up unit - not cheap, and then I would only use it in emergency.