this battery issue reminds me of the new elt batteries (lithium) that came out in the eighties, the Feds came out with new ELT's and made us change all ELT's for the new ones equipped with lithium batteries. These batteries overheated, exploded, or caught fire in flight. One year later they came out with new ELT's equipped with normal batteries!!Seems that when they mention Lithium, there is a problem associated....Don't they make tests to make sure that they are safe and trouble free??I have changed all my Nicads for Lead acid.