Does anyone bring these along (pack) on multi-week section hikes?

I know i can turn my phone off to save energy but eventually I am going to run out of a charge. I have been looking into rechargeable headlamps and am considering bringing along a GPS too. The phone and headlamp i consider necessities. The GPS is probably a luxury item.

Can most people mange their power such that they can make it the next resupply point? Do you have to hotel or hostel to recharge?

Does anyone have a trail report in regards to solar chargers they could share?

Three Backpacker-friendly Solar Chargers
http://www.backpacker.com/gear/elect...olar-chargers/

The Best Portable Solar Panel Reviewhttp://www.outdoorgearlab.com/Solar-Charger-Reviews