A Expandable capacity - Increase the capacity of DELTA Pro with an extra 3600Wh. A Triple power at up to 30% lower cost - 3-10kWh expandable capacity to fit your energy storage needs. Add up to two DELTA Pro Extra Batteries to gain a capacity of 10.8kWh. And it&';s up to 30% more affordable than a power station of the same capacity. A 10-year lifespan with an LFP battery - Get 10 years of daily use until it hits 80% of its original capacity. Embrace the 3000+ charging cycles enabled by the LFP battery chemistry. A Easy to use - Plug-and-play without setup. And use the EcoFlow app to monitor and control the DELTA Pro Extra Battery. A 5-Year Full Warranty - With one of the most comprehensive warranties in the industry, we go the extra mile to give you peace of mind.