The Primary thing builders must understand is NOT to use a Lithium Ion battery in their plane. We had a builder have a forced landing over this. Those batteries are light, and they have their fans, but I have spent a lot of time listening to the builder with the issue, and I am convinced that the internal circuitry represents an unacceptable risk on a Corvair powered plane. I am not alone in this, Dan Weseman has long said the same thing, and Builders like Ken Pavlou have removed their Lithium batteries after studying the issue.
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