The state of the art when it comes to LiFePO4 cells that you can find on the market right now has 2 to 3 times lower energy density by volume and weight (depend

The state of the art when it comes to LiFePO4 cells that you can find on the market right now has 2 to 3 times lower energy density by volume and weight (depending on form-factor). Personally, I would prefer the increased energy capacity of traditional Li-ion packs, and when properly designed they are extremely safe too.