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Energy efficiency classes and battery durability

Energy efficiency classes

The energy efficiency class of a smartphone or tablet is determined based on the energy efficiency index (EEI).

Table: Energy efficiency index (EEI) and the corresponding energy efficiency classes

Energy efficiency class	Smartphones Energy efficiency index (EEI)	Tablets Energy efficiency index (EEI)
A (most efficient)	EEI > 2,70	EEI > 7,90
B	2,30 < EEI ≤ 2,70	6,32 < EEI ≤ 7,90
C	1,95 < EEI ≤ 2,30	5,06 < EEI ≤ 6,32
D	1,66 < EEI ≤ 1,95	4,04 < EEI ≤ 5,06
E	1,41 < EEI ≤ 1,66	3,24 < EEI ≤ 4,04
F	1,20 < EEI ≤ 1,41	2,59 < EEI ≤ 3,24
G (least efficient)	EEI ≤ 1,20	EEI ≤ 2,59

The EEI shall be calculated with the operating system version installed on the product model on the date of placement on the market.

Detailed information on measurement and calculation methods can be found in Annex IV., and, until a harmonised standard is available:

The battery endurance (END_device) equals the run-time of the test in hours using the specified test sequence and, rounded to two decimal places.

The energy efficiency index (EEI) of a smartphone or slate tablet is calculated using the following equation and rounded to two decimal places:

Where: