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Havent noted a drop in performance yet of the powertank with my LX with guidescope etc aboard but for more energy drawing devices like heaters its probarly more economical in the end purchasing a lead sealed battery {deep discharge type} or if the budget allows a gel battery instead of a powertank variety . Even with my 35 amp battery with 2 heaters running at max {got the adjustable kendrick type controller and heaters} id get no more then 6hrs, at half strength which is usally all thats needed it will cover all night.Powertanks are good and convenient but for the heavy stuff spend a bit more to get it right in the first place so you dont have to drive back from a dark spot because your power has let you down.
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