The advantage of lithium ion batteries is that they store a lot of energy. And the disadvantage is that they store a lot of energy.
Need Circuit protection in the battery (Makes them more expensive)
When burning, LIPO batteries emit chlorine gas(sic) same as deathrow gas chamber type.
Recommended reading the "Conception" dive boat (California) from a few years ago where 35 customers lost their lives by way of LIPO batteries. Too many batteries for underwater cameras and lights charging off the same circuit and all next to each other where the batteries started a chain reaction fire.
NiCads and NiMh we were, I think,safer.