Asymmetric testing and deployment of storage devices

Energy storage cells are typically tested with the same charge and discharge currents, and deployments of such cells are limited to these currents for safety. Herein, cyclical testing methodology determines maximum safe charge and discharge currents, which are unequal. This allows for charge-intensive deployments, which make full use of the fast charging capabilities of the cells while using less demanding discharge rates. It also allows for discharge-intensive deployments, which make full use of the fast discharging capabilities of the cells while using less demanding charge rates. A profile manager controls the deployed cells under continuous use, high duty cycling or intermittent high power demands, and may transition cells between charge-intensive, discharge-intensive and symmetric operation.