They don&#x27;t use protection during <i>discharge</i>, which is the relatively safe part of the cycle. They&#x27;re careful to match the pack to the discharge demand to prevent thermal runaway. They&#x27;re also at a considerable distance from the pack when it is in use. During charging, any sensible RC hobbyist uses a good balance charger and a LiPo safety bag.<p>It&#x27;s also worth bearing in mind that lithium batteries replaced methanol and nitromethane fuel in the RC hobby, which isn&#x27;t exactly benign.