We have a couple as well, along with fire gloves and a bunch of regular extinguishers. Not sure how close I would want to get to a battery fire though to use the blanket.C CRYSTAL LEMON Fire Blanket Kitchen, Fire Blanket Fire Suppression Blanket, Fire Blanket Emergency, Emergency Survival Safety Cover for Kitchen, Fiberglass Blanket 39x39 inches https://a.co/d/f7zjItN
We have these located throughout our home. Seems like a reasonable stop gap to get the FD there in time.