Guys - In July 2001 I installed a Concorde sealed battery part # RG24-15 which was STC'd for my 1967 Skymaster. It was purchased from Aircraft Spruce & Specialty Co (877-477-7823) for $237.95 including freight.
This battey has more cranking amps and turns the engine over noticeably faster than the conventional wet battery ever did. No water to add, less corrosion and post deterioration due to loose acids, and no special charging requirements prior to installing or during operation. Just be sure your aircraft voltage regulators are set to charge at about the right rate. I made no changes to mine.
I was concerned about what the months of service might be in comparision to the 24 to 36 months which I have typically gotten from my wet cell batteries. I am now at 30 months and while cranking power has deteriorated slightly, I think it is still better than the wet cells were even when new.
I am very pleased with this battery and will install another when the existing battery has to be replaced.
Hope this helps.
FLY SAFE !!
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