Hi Matthew,
I've got an EQ5 GOTO which I believe can draw about 2A. So I bought a 12v 20Ah (I think it's SLA and I think it's a Panasonic) battery from a "batteryworld" store in Sydney (they are in Melbourne too). The guy in the shop made me a cable with a lighter socket at the end while I waited in store, and he did a really good job as it feels nice and sturdy.
All up for the battery and the charger and the cable it cost me $240.
I hope this helps :-)
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