[Peteren (Peter)]

Originally Posted by GraemeT

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.

Yes, fully agree, LiPo cells give enormous bang for your buck, all my RC equipment run’s on them
Just be aware of the limited discharge and strict charging requirements.
The rule of thumb for LiPo’s is “don’t charge them in anything you can’t afford to lose”
They have enormous amounts of stored energy that can go wrong and burn the place down