Just have flashlights stowed around your home. No need for an emergency light. I always have my Nitecore MH20 EDC. I also have a couple of Nitecore P12s in the house. Family knows where they are, even in the dark. They’re all powered by 18650s and they last a long time, especially when the lights are used at low setting.

If you want an always-ready flashlight that are low maintenance, look for models that can take AA batteries and put Eneloops in them. They can retain as much as 90% capacity even after a year of storage. I have a Mini Maglite LED in the car using Eneloops.