19/10/2016 · Of course, the battery pack is rechargeable. However, even if the battery back survived 1,500 discharge cycles at full capacity, the lifetime storage cost would still be $0.13/kWh… A total cost of about $0.22/kWh. Since heat degrades Li-ion battery life, they aren’t likely to maintain full capacity very long in places where solar PV works best (deserts), particularly with the newly