The share of charging energy recovered during a battery discharge test under standard conditions.
Energy round trip efficiency compares net energy delivered on discharge with the energy needed to restore the starting state of charge by a standard charge. Annex IV treats efficiency and its fade as documented parameters where applicable. The original proposal's “round trip energy efficiency” can be retained as a search synonym.
Energy round trip efficiency compares energy delivered on discharge with energy needed to restore the starting charge under the prescribed test.
Not a universal declaration for every battery or a measure of capacity fade.
Battery Regulation Annex IV defines this ratio using a discharge test and restoration of the starting state of charge.
EU Battery Regulation
‘Energy round trip efficiency’ means the ratio of the net energy delivered by a battery during a discharge test to the total energy required to restore the initial state of charge by a standard charge.
Formal definition in the cited source and edition; scope and application follow that instrument. Consolidated EUR-Lex text is a documentation tool; the Official Journal text is authentic.
Reference: Annex IV, definition (6)
Officially defined in the cited source. The verbatim source passage is shown separately from Minespider’s explanatory text; applicability follows that source.
Keep delivered and restoration energy, test method, start/end state of charge and applicability determination together.
We need the discharge and recharge measurements and conditions behind the ratio, not just a percentage on a product record.
Source anchor; see source context and definition status.
Open reference