From my model airplane messing I can tell you that lipo batteries are a different animal to many, using a balance charger each cell is charged to a specific voltage and as close to each other as possible, they also need to be stored at a specific voltage, also if they drop below a certain voltage either in use or by being left unused then they are scrap. They should be charged in a fire proof container, I use a Pyrex pot with a lid and charge on top of the glass hob. If you cut into one you'll burn your house down too!
Other than that they are good. 😀