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Many will tell you that a jump pack is great, but if you want to do it ONCE and do it properly then get yourself a 100 - 120 amp-hour battery. it will last you for 2 days imaging with a EQ6 pro mount, eeepc laptop (running though an inverter 12v-240v) and charging 40d batteries. your cost for the battery should be about 300-350 depnding on brand and add another 100 dollars for the correct charger (cheaper ones can be had but don't do the job as well). all in all if you get something like that and charge it correctly your battery should last for years and years with one friend of mine saying that his should last for 6-7 years before showing signs of loosing capacity! 400 dollars devided by that amount of time is a decent amount.
Things you need to look for.
Deep cycle battery.
Case for the battery.
Connections so you can plug everything in to the battery case!
the batteries are about 25-30kgs. and you will not have to worry at all about if you will run out of power. any other method and you have the worry of running out of juice mid flight! as for dealers, just look though your local yellow pages. you will find battery suppliers as they are not specialty items.!
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