Sorry to flog a dead horse. I've found several posts / threads regarding external power sources for mounts. At the moment I don't have any gear, but I'm adding up the $ and weight etc before diving in and purchasing everything only to then find out I forgot to consider something plus my budget has been blown WAY over what I initially envisaged haha.
So, I'm currently looking at purchasing an HEQ-5 pro (goto) and initially just mount a 200mm f2.8 lens onto my camera (nex5n) which gives me a 300mm @35mm equivalent, or a 300mm f4 lens (450mm equivalent). I won't be going down the guidescope way at the moment because of cost and apparently wide-field imaging should be alright for a couple minutes / sub so will be relying on accurate polar alignment and worm gears (please correct me if i'm wrong here).
Anyway, to summarise my findings, I can either go for the supercheap auto 900A (i think it's mA?) battery here
http://www.supercheapauto.com.au/onl...46#Description which I've read is a 17mAh battery (so lets say effective drain @average of 2A/hour over 50% drain = about 4-5 hours usage) or I can wire my own deep charge battery (which I would rather not do). I've also read differences about charge cycles etc for the two kind of batteries and it's all rather confusing. Is there any reason why I can't use something like this
http://www.ebay.com.au/itm/12V-Porta...item3f1b705a52 which says it can output 5A at 20Ah and because it is a lithium battery, I can drain it much lower? There is also the 10A rated one here
http://www.ebay.com.au/itm/12V-10A-P...item3f1ad97c3f
I'd then just get a socket such as this:
http://www.ebay.com.au/itm/Car-Batte...item416b6eac90 and solder it to this:
http://www.ebay.com.au/itm/12V-DC-Po...item3f19c4a64f
then dump the whole unit into a box or bag or something. Thoughts appreciated.