Commercial and industrial property insurer FM Global has completed the first-ever large scale fire tests of lithium-ion (li-ion) batteries in warehouse storage and released a research technical report describing the associated fire hazards and protection recommendations for rechargeable batteries.

Among the key findings:

  • Li-ion batteries present several unique fire hazards when involved in a fire, due to an ignitable electrolyte liquid contained within such products.
  • Densely packed li-ion cylindrical cells and polymer cells behave differently than li-ion power tool packs in such fires.
  • When bulk stored in corrugated board cartons, early fire extinguishment and cooling of the li-ion batteries is imperative to properly protect a facility.
  • Existing protection solutions used for other types of high hazard products and materials can be effective for protecting li-ion batteries stored in bulk arrangements.

The complete scientific research findings are available in a downloadable technical report "Flammability Characterization of Lithium-ion Batteries in Bulk Storage” at