How much do the golf cart batterries cost?

What about a small generator? I saw one of these the size of a small beer cooler and it was very quiet.

These can be pricey too........

cgi.ebay.com/ebaymotors/ws/eBayISAPI.dll?ViewItem&item=2467251780

Add e b a y.c o m where the asterisks are in the link above and it will work (remove the spaces).