I'm looking for a portable charger that I can keep in my pocket that will give me 50-80 percent of a boost if needed
I thought Apple had blocked all third party chargers on the 5s.
Apple does not "block all third party chargers" on the 5S. The limitation is imposed within iOS 7... and it only blocks NON-APPROVED, NON-LICENSED third party chargers. If Apple has approved and licensed the chargers, then all is good.
I'm looking for a portable charger that I can keep in my pocket that will give me 50-80 percent of a boost if needed
I just bought 2 Anker batteries. Good reviews and good price on amazon.