Hi Robert9,
seeing as MattyP hasn't answered yet, I'll jump in here with an answer...
Basically, any 12v battery will do. Typically what people buy is these car portable jump starter batteries that come with a pair of short jump start leads and a light. You'll know the sort I mean.
If you shell out around $100 you'll get a good one, but you can get them for around $50 if you don't want to spend that much. I have both, and both work faultlessly.
Cheers
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