5 ft. of Barley Fish Paper Battery Insulation Tape

This is very popular material for battery builders. Use this for extra protection to prevent shorts. You get 5 feet of material for every 1 you buy. If you choose quantity of 5 you will get 25 feet or material that is 2.5" wide.

Lifepo4 prismatic cells, for example, are mostly made of metal case housing with blue shrink wrap. You want something thicker than that shrink wrap in between your cells to prevent a short. Also this is a must have for cylindrical cells to cover the nickel connections.

This is a very thick and sturdy tape that is also non-conductive. Easy to cut with scissors and the back peels off easy as well.

2.5" is perfect size for 18650 cells but also you can line this material up in layers to easily cover any size. This size is very convenient to handle every project large or small and can be cut to size with scissors.