For about the same price as a small Jackery battery you could get a small 1200 watt generator which will deliver more power for a longer period of time and is a whole lot easier to keep producing power than a battery in a power outage. Most people probably have at least 5 gallons of gas sitting in their gas tank they can use in an emergency.
One of the jackery batteries will power your electric blanket, light, phone (not promoting jackery but for those who don't have generators)
https://www.amazon.com/s?k=jackery+battery&crid=UCKHB9UVJDEH&sprefix=jackery+battery%2Caps%2C144&ref=nb_sb_noss_1
For about the same price as a small Jackery battery you could get a small 1200 watt generator which will deliver more power for a longer period of time and is a whole lot easier to keep producing power than a battery in a power outage. Most people probably have at least 5 gallons of gas sitting in their gas tank they can use in an emergency.