The systems are based on a novel battery technology that allows new level of cost and performance metrics to be reached in energy industry. Deeya L-Cells are suitable and economic replacements for Lead-Acid batteries and diesel generators for applications requiring 2-50kVA of power and 4-24 hours of backup. The life time of a Deeya L-Cell is 7 years, after which it can be refurbished with minimal cost to run for another 7 years, ad infinitum. The L-Cells require minimal or no maintenance during this period. They are temperature independent and can be placed in an outside environment. Most importantly, they can be charged very fast. A 4-hour system can be charged in about 2 hours.