A lipo bag is an essential if you are charging within your house, a soft cell lipo is a very dangerous thing, I personally would never run a soft cell lipo in any sort of vehicle, for the extra money a hard cell as well as a lipo bag is worth it. If one of these cells swells in the middle of a run and you continue to pull on it there is a significant risk of it failing resulting in a fire, in which your vehicle is basically a write off as a lipo fire burns extremely hot and is very hard to extinguish. Having seen multiple lipo fires the results aren't pretty, we even had one customer lose his entire workshop due to the initial fire and then the resulting corrosive effects from the chemical within the battery. If you insist on soft cell lipos at least get the bag which will mitigate the possible damage