I have 2 Yuasa EN160-6 6V 160Ah batteries to sell. No longer needed. They were set up with a solar charging system to provide a reliable heavy duty 12V power system. Apparently these are the battery of choice for critical standby power applications. They would make the basis of a great solar recharged power source for your observatory, or put them on a trolley and wheel them out to your scope. They are in excellent condition and come complete with the connector bars and fasteners. These batteries retail for around $630 each. Will take $300 for the pair of them.
Sorry, these are collect only as they are way too heavy to post - 35kg each. Located in the Adelaide Hills.
See attached datasheet for battery specs. You can also find out more here.
http://www.yuasaeurope.com/eu/indust...oducts/en_enl/