During the trekking days from Lukla until Chhukung, you will be staying in teahouses or lodges at the end of your trekking day. So, you will be able to charge your electronic devices here at a small extra charge. But, after leaving Chhukung and until you climb Island Peak and get back to Pangboche, we will be reliable on solar chargers as long as the days are sunny otherwise charging your device is not possible. We recommend bringing extra batteries and power banks.