Manged to find some time in the evening to finish some protection for the battery. With the larges tube of shrink wrap I have ever used, some PTFE sheets, waterproof and heat resistant tap I wrapped the battery.

Shrink-wrapping is crucial safety and protection. The wrap forms a durable, insulating layer that prevents the battery’s metal casing from coming into contact with other conductive surfaces, thus avoiding short circuits and potential damage or fire. It also provides physical protection against moisture, dust, and other environmental factors, holds the battery cells together securely, and can improve the battery’s overall stability and thermal performance.

For additional protection the inside of the steel case is lined with 1mm PTFE sheet, a material that preforms well under high temperature with a melting point of 327°C and no appreciable decompositions at 260°C. It also has a really low coefficient of friction so sliding the battery in and out of the steel case for maintenance is easy.