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Having to travel often for work and I suffered some times the nuisance of having the mobile battery almost drain and not being able to find an outlet to charge it. Emergency chargers are widely available but I prefered to build my own.

This is the bill of material I used:

• LED flashlight for AAA or 18650 batteries (0,5€ eBay)
• Solar Boost DC-DC 3V-5V Adjustable Power Supply Module (3€ eBay)
• 8650 battery (3.7V 2600mA) and charger (less than 5€ eBay) Read more of this post