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I use Bosch 120A/H deep cycle batteries which cost me last time, if I remember correctly, around the $230 mark from our local Battery World.
Nightstalker - deep cycle are designed to run LOWER than your typical standard cranking battery, but should not repeatedly be taken to lower than 40% charge. They are able to be run this low (11.8-12.2v) some hundreds of times without loss of performance. I also run my car fridges off these with great success.
A 120A/H battery is heavy, a 70A/H less so...... and it would do most telescope/laptop/camera/heater applications for several nights.
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