One of the best electric skateboards on the market is suffering from battery problems. In a blog post, Boosted confirmed that its second-generation board has overheated on two separate occasions. In both instances, a lithium battery cell "vented" inside its fire-retardant enclosure -- no-one was hurt, but as a precautionary measure the company has advised against charging and riding its boards. At least for the time being, until it can finish a "thorough investigation" and figure out the root of the problem. For now, Boosted has said it will stop shipping new boards to its customers too.