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IMHO, the power requirements of your mount would seem to warrant a Gel Cell, which is usually what's inside those Supercheap Jump Starters. Buying a battery on its own without the fancy box probably makes sense. I already had one of those jump starters when I bought my ETX and it works well.
That said, I've been a fan of LiPo batteries for their capacity per kilo for some time as these are used by RC model aircraft & boats, where size and mass are factors. My dob's equatorial platform uses a 2.2 AH 11.1 volt LiPo, which will run it all night on a single charge, (although I always keep another in reserve). Charging needs to be done with a LiPo balancing charger which can be expensive, but it's only 165gm and measures 100x30x20mm.
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