Battery management is more important than battery technology!
Battery management systems (BMS) are the brains of an energy storage system. The BMS controls the charge/discharge cycle and monitors the depth of discharge to protect the battery. Often the BMS will have a set point that will turn the batteries off at a designated depth of discharge to protect the battery from damage caused by over discharge. Due to expense, there is usually no BMS in less expensive batteries but is a requirement for those looking to invest in a high capacity energy storage system. The BMS is just as important as the battery technology!