Maintenance Matters

August 2011 Issue

Aircraft Batteries: Concorde Still Excels

We’ve put Concorde and Gill batteries, both sealed and flooded, head-to-head for a decade now. Concorde has taken the ribbon every time.

We have tested Concorde and Gill aircraft batteries on multiple occasions looking for the longest battery life and best value. In our view, and in our opinions expressed in our reader polls, Concorde’s products are a better bet. Our gold standard has been the FAA capacity test as the core of that test methodology since it takes each battery’s amp-hour rating into consideration during the test, so we are testing apples-to-apples, so to speak. Per FAR 23.1353(h), we look for 80-percent capacity at the one-hour discharge rate. This simulates the stress of an alternator-out situation where battery power alone keeps the essential electronics bus running for a minimum of 30 minutes. There is no established standard for the number of cycles a battery must undergo, and we were only checking to see if the battery passed or failed each test.

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