FactRatedMost Energy-Efficient Smartphones by Official Energy Class
A smartphone's energy-efficiency class is not simply a battery-life ranking. The official A–G class is based on an Energy Efficiency Index that relates standardized battery endurance to battery energy. A phone can therefore have the longest runtime without necessarily having the strongest efficiency result.
FactRated orders/groups current smartphones by their registered energy class from A to G. If the canonical numeric EEI is not available in the normalized API data, the site does not invent a more precise efficiency order inside the same letter class.
Eligible models: 1,057 · Excluded because the ranking metric is unavailable: 0
Order: Energy efficiency class — official class, A to G. Tied values share the same position. The displayed top percentage includes every model tied at that value. At least 30 comparable models are required for contextual positions.
1,057 results
| # | Model identifier | Energy efficiency class | Battery endurance | Battery cycles | Repairability index | Compare |
|---|---|---|---|---|---|---|
| 1 |  motorola razr 70 (XT2657-1)razr 70 (XT2657-1) | A | 59 h 37 min | ≥ 1,200 cycles | 3.46 | |
| 1 | motorola razr 70 plus (XT2659-3)razr 70 plus (XT2659-3) | A | 48 h 53 min | ≥ 1,200 cycles | 3.46 | |
| 1 | motorola razr 70 ultra (XT2655-1)razr 70 ultra (XT2655-1) | A | 51 h 23 min | ≥ 1,200 cycles | 3.41 | |
| 1 | motorola razr fold (XT2651-1)razr fold (XT2651-1) | A | 59 h 17 min | ≥ 1,200 cycles | 3.62 | |
| 1 | motorola signature (XT2603-2)signature (XT2603-2) | A | 52 h | ≥ 1,200 cycles | 3.61 | |
| 1 | motorola ThinkPhone25 (XT2409-6)ThinkPhone25 (XT2409-6) | A | 50 h 44 min | ≥ 1,200 cycles | 3.96 | |
| 1 | Mudita KompaktKompakt | A | 40 h 8 min | ≥ 800 cycles | 2.43 | |
| 1 | Mudita Kompakt-NAMKompakt-NAM | A | 40 h 8 min | ≥ 800 cycles | 2.43 | |
| 1 | MUNBYN AS01AS01 | A | 90 h 49 min | ≥ 1,500 cycles | 3.1 | |
| 1 | MUNBYN IPDA087IPDA087 | A | 90 h 49 min | ≥ 1,500 cycles | 3.1 | |
| 1 | MUNBYN IPDA089IPDA089 | A | 90 h 49 min | ≥ 1,500 cycles | 3.1 | |
| 1 | MUNBYN IPDA099IPDA099 | A | 90 h 49 min | ≥ 1,500 cycles | 3.1 | |
| 1 | MUNBYN IPDA100IPDA100 | A | 90 h 49 min | ≥ 1,500 cycles | 3.1 | |
| 1 | MUNBYN IPDA101IPDA101 | A | 90 h 49 min | ≥ 1,500 cycles | 3.1 | |
| 1 | MUNBYN IPDA102IPDA102 | A | 90 h 49 min | ≥ 1,500 cycles | 3.1 | |
| 1 | MUNBYN MC005MC005 | A | 90 h 49 min | ≥ 1,500 cycles | 3.1 | |
| 1 | myPhone N23 LiteN23 Lite | A | 46 h 45 min | ≥ 400 cycles | 3.85 | |
| 1 | NEOW SAFE PLUSSAFE PLUS | A | 55 h | ≥ 1,000 cycles | 3.57 | |
| 1 | NOTHING A001TA001T | A | 53 h 56 min | ≥ 1,400 cycles | 2.83 | |
| 1 | NOTHING A009PA009P | A | 63 h 19 min | ≥ 1,400 cycles | 2.94 | |
| 1 | NOTHING A069PA069P | A | 63 h 24 min | ≥ 1,400 cycles | 2.99 | |
| 1 | nubia NX741JNX741J | A | 90 h 35 min | ≥ 1,000 cycles | 3.44 | |
| 1 | nubia Z2570NZ2570N | A | 74 h 1 min | ≥ 1,000 cycles | 3.36 | |
| 1 | nubia nubia Neo 5 GT 5G Special EditionZ2570N Special Edition | A | 74 h 1 min | ≥ 1,000 cycles | 3.36 | |
| 1 | nubia Z2587NZ2587N | A | 55 h 44 min | ≥ 800 cycles | 3.26 |
Data source: EPREL · Last updated: Sep 7, 2026
How this page works
The primary comparison is the official energy class. Models in class A appear before B, then C through G. Within a class, FactRated may use a clearly labelled secondary sort such as battery endurance for usability, but that secondary order must not be described as a more precise energy-efficiency ranking.
Battery capacity, cycle durability and repairability appear as context because efficiency is only one part of product choice.
Energy class vs battery runtime
Runtime asks how long a full charge lasts under the standardized workload. Efficiency asks how effectively the device obtains that runtime from the battery energy used in the calculation.
That is why comparing only mAh or only hours can miss part of the picture.
Smartphones and slate tablets also use different EEI class thresholds, so FactRated keeps their energy-class pages separate.
Frequently asked questions
Is class A always the phone with the longest battery life?
No. Class A is the highest energy-efficiency class; absolute standardized runtime is a different measurement.
Does a larger battery automatically improve the energy class?
No. The efficiency calculation relates runtime to battery energy, so simply increasing capacity does not guarantee a better class.
Can FactRated rank two class-A phones by efficiency?
Only if a canonical numeric efficiency value is available to support that order. In beta, FactRated does not create extra precision from unrelated fields.
Can I compare smartphone and tablet energy classes in one ranking?
Not as one common numeric ladder. The class thresholds differ between the two device types, so FactRated keeps their ranking cohorts separate.
Related FactRated pages
- Smartphone energy-efficiency classes explained
- Longest standardized battery endurance
- Filter by energy class
Data source: EPREL · Last updated: Sep 7, 2026
Data source: EPREL · Last updated: Sep 7, 2026