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The long bodied Mooney has two batteries. In the past I have experience with both named batteries, C and G. My experience over the years has been to replace the old wet type battery every 3-4 years. Even the older sealed batteries suffered and did not perform well. The new GILL 7000 series sealed battery (7243-14 for our Mooney's) is FANTASTIC! WOW the starting power is the best ever! Truly,Hands down, no comparison. I have used the Gill 7243-14 on extreme cold days in the Rockies and hot days in the south. The cranking power is great even after prolonged time of no starts, this Gill sealed battery really performs! Another important point I have observed over the last twenty years is the customer service and responsiveness of Gill. They are timely in taking your call or getting back to you. They will assist and troubleshot with you or your mechanic. A lost art in todays commercial world. Please do not interpret this as a commercial but rather a way to assist others when they need a new battery and my experience with these new sealed batteries. For years aircraft batteries have been old technology. Our cars have far better batteries and cranking power for a fraction of the price. Gill has spent time developing, testing, and certifying the 7000 series sealed battery and it shows! Thus far the cranking power cannot be beat. I will report back on longevity. Happy Flying!