Useful extras
Switch to mini-solar power
Forever forgetting to recharge your cell phone? One way to power your phone up and treat the earth kindly at the same time – without even plugging in! – is to invest in a universal solar charger.
Available for between $50-$95, most devices are compact and can easily fit in your knapsack. They power numerous mobile devices via power adapters.
Today, challenge yourself to find a store in your area (or online) to buy one of these nifty tools. And then, switch to a sun-powered charger for your phone or other portable electronic device. Most charge in all weather conditions in as little as three hours.

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I also use a 6 volt solar cell to recharge AA rechargeable batteries.
heat it up