Not all lithium battery cells are equal. Some manufacturers use cheap cells, with very few safety features. The cells we use in our Inergy battery designs go through an extensive 3rd-party testing process, and we tightly control our sources. Li-LFP and Li-NMC batteries are required to pass the same safety standards just to be able to ship them.We don't change battery manufacturers often OR lightly, with any changes we make going through our FULL re-certification and validation process. Our batteries contain a wide array of protections, from the cell level to the BMS (battery management system). Our batteries are some of the safest on the market, thanks to our in-house, proprietary, USA-designed BMS and batteries.These days, almost every EV car and truck uses Li-NMC. It just isn't possible to get the range consumers demand from Li-LFP batteries. This caused a rapid advancement of Li-NMC safety technology across the market to meet the needs of the automotive world. Being a portable system, the Flex Tactical makes use of high-density Li-NMC chemistry to achieve some of the most energy-dense batteries on the market. Other chemistries such as Li-LFP and lead-acid/AGM are much heavier, much larger, and (in the case of Li-LFP) more expensive. Li-LFP does have its advantages, especially in permanent DIY installations or rapid charge/discharge applications. They offer higher cycle life counts and have some enhanced safety by volume, but are usually not ideal for portable solutions due to the extra weight and space needed for these benefits. In fact, many manufacturers use Li-LFP in order to loosen their safety standards, meeting the same requirements of Li-NMC batteries but not exceeding them. Li-NMC offers the highest energy density and, with the Flex system's advanced safety features, is lighter and more compact than other battery chemistries without sacrificing safety.