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Before investing in ways to charge your phone, you may want to maximize your battery-saving setup first.
Are you:
>leaving the screen on, and bright to be able to see it in the daytime, for long periods of time?..don't as it pulls lots of power. Use a turn-by-turn voice nav option (Osmand) with a bluetooth earbud if you need it.
>in areas where your phone is search for a cell signal?..don't as it pulls lots of power. Put the phone in airplane mode to prevent incoming and outgoing signals. Use offline maps(maps.me, osmand) with imported GPX tracks or routes planned within either map app.
>using an active-cell tower sourced nav app like google maps?..don't as it pulls lots of power. Use one of the above mentioned offline apps in airplane mode. Your phone is then only bringing in the GPS signal(minimal power).
>use your phone settings to put it into batt-saving mode as much as possible