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Does anyone know of a brand of an external battery charger (preferably "gel pack") that would have a long life? We are using a Trimble 5600 Robotic Total Station. We have been using an external car charger, but it has a shorter battery life in the winter than we would like. I have heard the gel packs have longer battery life. It needs to have a circular plug opening on the battery itself for the adapter to the total station.
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