Before revision:  Additionally, a correct recognition of the barriers and advantages by all the stakeholders, including the system /  market operator, policy maker, investor, and project manager, is the key factor to promote battery storage technologies in grid-connected applications. For market and system regulators, more efforts are necessary to reduce the barriers from regulatory framework, promote pilot projects, and design appropriate market products or services that adequately address the flexibility provided by different technologies .
After revision:  Additionally, a correct recognition of the barriers and advantages by all the stakeholders, including the system / market operators interested in promoting grid-connected battery storage under a deregulated power market .