Enphase Energy has announced in a SEC filing that it has signed a six-year deal for Japan’s Eliiy Power to exclusively supply its battery cell and battery management units for the Enphase AC Battery. The development and supply agreement cements the relationship between the two companies, which have collaborated since 2014 on the development of the new Enphase AC Battery. The AC Battery will be rolled out to the Australian market later this year before being introduced in the U.S. and select markets in Europe in 2016. A modular battery built using Eliiy’s lithium-based technology, a typical system provides 1.2 kWh or energy storage and 275/550 W power output.