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It's the understanding as a result of learning that costs little yet is priceless that makes all the difference About the only easy way to make a comparison for that bit is, buying a border collie pup doesn't mean you have just purchased a champion sheep dog. The cost of training it yourself is minimal, the knowledge and patience to do it is priceless. Setting up and using a lithium battery pack goes along the same lines, without the knowledge you need someone to build a fail safe system to protect the battery, then you are paying for someone else’s time and knowledge and that rarely comes cheap.
The private forum has the needed information but comes with a condition that what you learn is for your personal use, not to be shared or published outside the private forum.
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All lithium technology batteries are li-ion, just as calcium, flooded, agm, gel, starter, deep cycle are all lead acid batteries, it's just the way they store and release their energy, I won't even attempt to explain how that happens with Li-ion batteries here, the eyes would roll and everyone would nod off
LiFeP04 or lithium ferrous batteries are the safest of the breed, they don't burst into flames, tortured they will release a vapour a bit like boiled petrol but it dissipates or settles out into droplets as soon as it cools. The battery is stuffed if you torture it that far, it's the electrolyte boiled away, there is only about a tablespoon in each cell packet and you can't replace it. The alloy of these metals combined make them unaffected by water where pure lithium reacts badly in water, you can dead short it or shoot a hole through it and all that will come out is this boiled electrolyte vapour.
The ones that caught fire in the Boeing 787 were lithium manganese, nearly as unstable as lithium polymer (LiPo) they need to have your full attention when charging them and if you very fast discharge them, they suffer thermal runaway and burst into flames if you stray outside the safety zones even a little bit. Lithium ferrous don't do any of these things, but a big wander outside the safety zones will kill them, just like a lead acid battery, but no explosive gas is produces, just the quick dispersing petrol like vapour but it is flammable while in the vapour stage just the same.
The fail safe nature of the Diy battery management system they have developed ensures full safety.
