It also used fiberglass or rock wool insulation hat would saturate with water then sag into a soggy mess. I used to work for an appliance store and I hated dragging these old beasts out because they usually held 300 pounds of water. One was so bad we had to cut it in pieces to get it out! I repaired electronics for a living but pitched in to help when needed in other jobs. Got me out of the shop and into fresh air once in awhile!
In order to charge it you need to pull a vacuum on the lines, if it doesn't already have a charge port one can be silver soldered in. Best left to a professional who has the right equipment!
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