keth0601
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Unfortunately your usb solar panel is probably not the correct voltage for your 12v battery.
There are a number of portable solar chargers out there for a 12 volt battery, but one thing I would keep in mind is that if your battery is lead acid/SLA/AGM you may be disappointed with the speed at which it charges off of solar. Lithium batteries like the ones that typically supply USB devices charge much more efficiently. You might be better off just bringing a backup 12v lithium battery/power supply like a car jumpstarter (many can be used as a 12v power supply).
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