by
EcoFlow DELTA Pro Generator Extra Battery 3600Wh LFP Certified Refurbished
DELTA Pro Smart Extra Battery 3600Wh. Capacity 3600Wh 3600Wh 4096Wh 4096Wh 7200Wh 7200Wh. Just plug the generator directly into your extra battery via the port on the back. This works even when disconnected from your DELTA Pro.