Lithium ion (Li-ion) main batteries are becoming more and more common but not without teething troubles. A number of high-profile safety incidents have given the technology a black eye. The danger of thermal runaway is a serious issue and if you have the technology installed in your aircraft you need to keep up to speed. One place to learn about this technology is in FAA Advisory Circular 20-184: “Guidance on Testing and Installation of Rechargeable Lithium Battery and Battery Systems ...

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