Cited sources
Last verified 2026-09-25.
- Kyocera builds Enerezza around its own semi-solid clay-type lithium-ion battery and, by its own research as of 2 October 2019, calls it the world's first system with a built-in clay-type lithium-ion battery; the name glosses in English as a single-function storage system.
- Kyocera lists suggested retail prices for three models (5.5, 11.0 and 16.5 kWh) and states they are Japanese domestic specification that cannot be used outside Japan.
- The listed battery capacities are not usable figures: Kyocera notes real-use capacity is net of losses and gives initial effective capacity of 4.7, 9.4 and 14.1 kWh measured to JIS C4413.
- It cannot be scored yet because the product page gives no round-trip efficiency, no cycle count, no IP rating and no certification listing, and its 15-year equipment and capacity warranty states no retention percentage.
- The world-first claim is Kyocera's own finding, not an independent rating, and this record is not joined to any scored or evidence record.
- KYOCERA: 単機能型蓄電システム Enerezza（エネレッツァ） product pagehttps://www.kyocera.co.jp/solar/products/enerezza/
Kyocera's own Japanese product page establishes the product name, the three model codes with capacities and suggested retail prices, the semi-solid clay-type battery, the 15-year warranty and the Japan domestic specification.