On some phones, at least iphones, the batteries are not easily changed, if at all. But that is a great option on some phones, as a previous poster said.
I, too, have been trying to figure out the best way to have power in the outback. The best solar options have battery storage. in my case, I want and need significant 12v storage to run LED navigation lights, GPS, and lighted deck compass. And it would be nice to charge a cell phone.
I think a lithium ion 12v 9800mAh battery would have plenty of storage needed to recharge a phone many times. Check the auction site. I've even seen one that had three sets of terminals, for 12V, 9v, and a 5v USB output.
For really long trips, pair a "large" battery like this with a solar charger. you would have about $65 in it, if you did the wiring yourself.
URCHIN Portable Anchor
Kayak Deck Gear Bags
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