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You will indeed need a resistor. If you set it to 15V there is still nothing to stop the current from rushing into the battery, so I reccomend using a slightly higher voltage and a resistor.
Hey, rhanks for your for your feedback. I also played with the thought of adding an inverter, but good ones are way to expensive and my battery hasn't got enough power for larger devices anyways. However, I can use my power pack to charge my laptop via the small adjustable inverter that I build some time ago.By the way, I am now finally in the contest (after I remembered to enter :D) and people can vote for me.
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