I never said that they were insurmountable, but currently there is NOT a viable solution if the battery does go into thermal runaway, all they do now is allow it to burn itself out, then tackle the remaining fire. Meanwhile, releasing the following gases, some of which are fatal if inhaled or come into contact with skin. The source for evidence is here Review of gas emissions from lithium-ion battery thermal runaway failure — Considering toxic and flammable compounds - ScienceDirect Oh and also for the record this report also states that LFP is even more toxic in the event of a thermal runaway then NMC batteries, this is an extract from the Conclusion in the linked to documentation "While NMC batteries release more gas than LFP, LFP batteries are significantly more toxic than NMC ones in absolute terms." Table 2. Common LIB off-gas components, hazards and exposure limits. Substance Hazarda Exposure Limit, 8 h (mg/m3 )b Exposure Limit, 15 min (mg/m3 )b Carbon dioxide, Cause headaches, dizziness, confusion, loss of consciousness, and asphyxiation at high concentrations [52]. 9150 27 400 Carbon monoxide, CO Toxic if inhaled, may damage the unborn child, causes damage to organs through prolonged or repeated exposure and is an extremely flammable gas. 23 117 Hydrogen, H Extremely flammable. See noted Hydrocarbons Flammable. See noted Hydrogen fluoride, HF Fatal if swallowed, is fatal in contact with skin, is fatal if inhaled and causes severe skin burns and eye damage. 1.5 2.5 Hydrogen chloride, HCl Severe skin burns and eye damage, is toxic if inhaled, may damage fertility or the unborn child, causes serious eye damage, may cause damage to organs through prolonged or repeated exposure, may be corrosive to metals, may cause respiratory irritation and contains gas under pressure and may explode if heated. 2 8 Hydrogen cyanide, HCN Fatal if swallowed, is fatal in contact with skin, is fatal if inhaled, causes damage to organs through prolonged or repeated exposure, is very toxic to aquatic life (with long lasting effects) and is an extremely flammable liquid and vapour. 1 5 Nitrogen dioxide, NO Fatal if inhaled, causes severe skin burns and eye damage; and may cause or intensify fire (oxidiser). 0.96 1.91 Sulphur dioxide, SO Severe skin burns and eye damage and is toxic if inhaled. 1.3 2.7 Solvents Highly flammable liquid and vapour [53]. Very irritating to eyes, skin and airways [44]. DEC 700, PC 8.5c DEC 1000, PC 8.5c a Cited from the European Chemicals Agency [53], unless otherwise stated. b Cited from the HSE [47], unless otherwise stated. c Cited from the IFA [54] for the solvents DEC (Romania) and PC (Germany), other common electrolyte solvents (e.g. EC and DMC) are not listed. d Hydrocarbons, such as CH, are described as acting as simple asphyxiants without other significant physiologic effects when they are present in high concentrations, hence are not given limit values as the significant factor is the availability of oxygen [55]. This is assumed for H as well.