DELTA 2 SMART EXTRA BATTERYDESCRIPTION Expandable capacity Increase the capacity of DELTA 2 PORTABLE POWER STATION with an extra 1024Wh. Double power at up to 30% lower cost 2kWh expandable capacity to fit your energy storage needs. And it's up to 30% more affordable than a power station of the same capacity. 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