I use a car Repco 900amp Jumpstart battery pack for both my Meade SCT and my 14" Dob as well as powering the scopes computers it powers my laser finder, DSI cooling fan and skyfi wireless. I can run multiple sessions on both scopes and only ever charge it every now and then. The only way to go in my opinion. Grab a few bits from your local electronics store and or wire up all the cables your self and you are set.
I got a bit of rubber matting from Bunnings that was some type of floor matt that only cost me around 25 bucks. A bit of cutting and some sticky Velcro and it one great light shroud. Just make sure you stitch or add your own glue to the Velcro as it will come off.
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