We stock up in November, just in case. The "storm center" here in our garage has plenty of batteries for the flashlights and radio, bottled water, candles and matches, in case of power outage. We also buy extra toilet paper and canned goods.
For the sewing room, I stock up on needles and thread, and I have a battery operated Ott lite that is just priceless. A dear sweet friend gave it to me at Christmas, and it's wonderful for hand sewing in a blackout!