I have always used the Gill G242. My experience has also proven that 3 years is the norm. When I replaced my last one 18 months ago, I also purchased a battery minder and use it whenever the airplane is sitting. My hope is the battery will last longer but I won't know the answer for another 18 months. It is frustrating to me the lack of longevity with these batteries, especially for what they cost, but it seems to simply be a "fact of life." Supposedly the battery minder will extend the life. I hope it does. Stay tuned.
Ed
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