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they're powered by lithium ion batteries, which contain a large amount of energy in a small space. but if a cell in a faulty battery heats up uncontrollably, this can happen — thermal runaway, demonstrated here in a lab. the owner of this electric bike was lucky to escape unharmed. in cambridge, last summer, gemma germeney and her children, lilly and oliver died in a fire caused by a faulty e—bike battery. her partner, scott, was badly burned, but managed to escape the blaze. i screamed, "gemma, the kids, pass me the kids". and i heard a voice from her saying, "i can't get out." as well as tougher enforcement of quality control and safety standards, the petition is also calling for clearer guidance on safe handling and potential dangers.