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If like me, you worship at the alter of Ryobi 18v power tools and already have numerous batteries, google up Ryobi 18V 120W ONE+ Battery Power Source R18BT12V which is an absolutely awesome add on for a hundred bucks and supplies 12V and usb power with whatever sized batteries you already have.
I run my portable scope off one with a 4Ah battery and its good for a few hours.
I have a 100Ah lithium in a decent battery box for the heavy sessions, but if you just fancy a couple of hours under the stars with an eyepiece ...
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