Certain Flashlights May Not Be Enough

During a conversation recently, a friend told me about the emergency flashlights in her home.  They plug in and store at an electrical outlet, recharging constantly, and when the power goes out they turn on automatically to shine on the floor providing emergency lighting.  "Are those your only emergency flashlights?" I asked. They are.

Here are my concerns:
  • In an emergency, the charge may fail too soon if the flashlights come on automatically.  Let's say you leave for work Friday morning at 7:30 am, and your home loses power shortly after.  That night you go out to dinner and a movie with a friend right after work.  You arrive home at 10:00 pm to a dark house with no working flashlights because these flashlights have already been shining for 14 hours!