I bought the extra battery to complement my Delta Pro and smart generator as a home backup system. I like the Ecoflow products and the way they provide the complete home backup solution. I do wish they would provide better instructions on connecting the extra battery and Delta Pro together. It seems there are some things that need to happen to get the BMS and cells calibrated. I had to go on facebook and describe my problem to gind out why my Delta Pro and extra battery were not discharging together. I haven't had the extra battery long but I believe I have a good backup solution and Ecoflow will correct any problems I may have waith their good customer service and the support of social media.
I have lived on boats and I am accustomed to using battery power and power management. When I saw what EcoFlow had produced with the Delta Pro I bought one, an extra battery and solar panels. I live in Florida and deal with power outages because of summer storms and hurricanes.
Now during a power outage I can sleep without the noise of a generator. Run the EcoFlow at night and charge by solar, assisted by my generator during the day.
I purchased the Delta Max in 2021, and late 2022 I got the the Delta Pro and the two batteries last month and I am planning the purchase 1 more set next month. That says a lot!
Because of the energy policy of the current administration, I expect black out this winter. With my ecoflow pro, I have 8 hrs of quiet power for my fridge and oil burner. With that extra battery, I have 16, more than I need for a quiet night.