I am happy to announce that the IET Standards Technical Briefing: Electrical Energy Storage: an introduction is available online as a free download and is available here: http://www.theiet.org/resources/standards/eesstb.cfm.
We’re hoping that it will act as a good complementary document to the forthcoming Code of Practice for Electrical Energy Storage Systems. Please pass on this link to anyone you think will find this document useful.
For more information on the Code of Practice for Electrical Energy Storage Systems, please visit: http://www.theiet.org/resources/standards/eess-cop.cfm.