DELTA PRO SMART EXTRA BATTERYDESCRIPTION Expandable capacity Increase the capacity of DELTA Pro with an extra 3600Wh. 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. 10 year lifespan with an LFP battery Get 10 years of daily use until it hits 80% of its original capacity. Embrace