FactRatedMost Energy-Efficient Tablets by Official Energy Class
For a slate tablet, energy efficiency and battery runtime answer different questions. Runtime tells you how long a charge lasts in the standardized tablet workload. The A–G energy class instead reflects the category's Energy Efficiency Index and therefore how that registered endurance relates to battery energy under the regulatory calculation.
FactRated groups current slate tablets by their registered class from A through G. It never merges these class bands with smartphone classes: slate tablets use their own endurance workload and their own EEI thresholds.
Eligible models: 1,343 · 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.
1,343 results
| # | Model identifier | Energy efficiency class | Battery endurance | Battery cycles | Repairability index | Compare |
|---|---|---|---|---|---|---|
| 160 |  Blackview Tab 50 KidsTab 50 Kids | D | 88 h 19 min | ≥ 800 cycles | 3.4 | |
| 160 | Blackview Tab 50 WiFiTab 50 WiFi | D | 89 h 18 min | ≥ 800 cycles | 3.49 | |
| 160 | Blackview Tab 60 ProTab 60 Pro | D | 142 h 30 min | ≥ 800 cycles | 3.4 | |
| 160 | Blackview Tab 60 Pro KidsTab 60 Pro Kids | D | 142 h 30 min | ≥ 800 cycles | 3.4 | |
| 160 | Blackview Tab 70 WiFiTab 70 WiFi | D | 112 h 6 min | ≥ 800 cycles | 3.48 | |
| 160 | Blackview Tab 9 WiFiTab 9 WiFi | D | 137 h 41 min | ≥ 800 cycles | 3.81 | |
| 160 | Blackview Tab 90Tab 90 | D | 142 h 30 min | ≥ 800 cycles | 3.72 | |
| 160 | Blackview Tab 90 WiFiTab 90 WiFi | D | 128 h 54 min | ≥ 800 cycles | 3.42 | |
| 160 | Blackview Tab A5 KidsTab A5 Kids | D | 78 h 30 min | ≥ 800 cycles | 3.57 | |
| 160 | Blackview Tab A6 KidsTab A6 Kids | D | 90 h 36 min | ≥ 800 cycles | 3.56 | |
| 160 | Blackview ZENO 10ZENO 10 | D | 157 h 14 min | ≥ 800 cycles | 3.61 | |
| 160 | Blackview ZENO 5ZENO 5 | D | 41 h 15 min | ≥ 800 cycles | 3.61 | |
| 160 | BOOX BOOX Go 10.3BOOX Go 10.3 | D | 61 h 43 min | ≥ 1,000 cycles | 2.46 | |
| 160 | BOOX BOOX Note MaxBOOX Note Max | D | 87 h 29 min | ≥ 1,000 cycles | 2.4 | |
| 160 | BOOX Go 7Go 7 | D | 36 h 39 min | ≥ 1,000 cycles | 2.5 | |
| 160 | BOOX Go Color 7 (Gen II)Go Color 7 (Gen II) | D | 43 h 2 min | ≥ 1,000 cycles | 2.5 | |
| 160 | BOOX Go Color 7 (Gen ll)Go Color 7 (Gen ll) | D | 43 h 2 min | ≥ 1,000 cycles | 2.5 | |
| 160 | BOOX Note Air 4CNote Air 4C | D | 59 h 54 min | ≥ 1,000 cycles | 2.61 | |
| 160 | BOOX Note Air4 CNote Air4 C | D | 59 h 54 min | ≥ 1,000 cycles | 2.61 | |
| 160 | BOOX TAB X CTAB X C | D | 91 h 5 min | ≥ 1,000 cycles | 2.49 | |
| 160 | Bundy Mobile BT7 ProBT7 Pro | D | 47 h 10 min | ≥ 800 cycles | 3.54 | |
| 160 | Cepter CTABERAV2CTABERAV2 | D | 89 h | ≥ 800 cycles | 3.59 | |
| 160 | Cepter CTABLOTUSV2CTABLOTUSV2 | D | 114 h | ≥ 800 cycles | 3.63 | |
| 160 | CMX S26ultraS26ultra | D | 79 h 32 min | ≥ 800 cycles | 2.92 | |
| 160 | CTW GmbH AD13ZAD13Z | D | 8 h | ≥ 800 cycles | 2.44 |
Data source: EPREL · Last updated: Sep 7, 2026
What this tablet ranking can tell you
Use this page when your question is which current tablets fall into the stronger official efficiency bands. The class is the primary comparison signal.
Supporting columns such as standardized endurance, rated battery capacity, cycle durability and repairability remain visible because two tablets in the same energy class can still differ substantially on ownership characteristics. Those columns do not secretly become a second efficiency formula.
If the normalized source does not expose a reliable canonical numeric EEI, FactRated treats products in the same letter class as tied on the available efficiency evidence. It does not manufacture a finer order from battery hours, mAh or another unrelated metric.
Why the tablet cohort stays separate
Slate tablets are not simply large smartphones in this dataset. Their standardized battery-endurance sequence is different — the tablet cycle lasts 360 minutes and uses a different mix of active tasks and idle periods — and their energy-class thresholds are category-specific.
That means a class A tablet and a class A smartphone each occupy the strongest band inside their own regulatory category, but the letters should not be treated as one cross-device numeric league table.
For slate tablets, the official EEI class bands are:
| Class | Slate-tablet EEI |
|---|---|
| A | greater than 7.90 |
| B | greater than 6.32 up to 7.90 |
| C | greater than 5.06 up to 6.32 |
| D | greater than 4.04 up to 5.06 |
| E | greater than 3.24 up to 4.04 |
| F | greater than 2.59 up to 3.24 |
| G | 2.59 or lower |
These are not the smartphone EEI thresholds. If your goal is absolute time away from a charger rather than efficiency, use the dedicated tablet battery-endurance ranking instead.
How to use energy class with other tablet data
A practical comparison can keep the questions separate:
- Energy class: how strong is the tablet's official efficiency band?
- Battery endurance: how long did the registered tablet run under the standardized tablet workload?
- Battery cycles: what minimum long-term cycling band is declared?
- Repairability: how does the tablet score under the official repairability methodology?
FactRated exposes those fields side by side rather than turning them into an opaque overall score.
Frequently asked questions
Is class A the highest tablet energy-efficiency class?
Yes. A is the strongest efficiency class and G the weakest under the slate-tablet thresholds.
Does the class-A tablet necessarily have the longest battery runtime?
No. Energy efficiency and absolute standardized endurance are related but different measurements. Use the battery-endurance ranking for runtime per charge.
Can I compare a tablet's class directly with a smartphone's class?
Not as one numeric ranking. The A–G labels are familiar across the two categories, but the underlying thresholds and endurance test sequences differ.
Why can several tablets appear tied inside one class?
Because FactRated only creates a finer efficiency order when a canonical numeric efficiency value supports it. A letter class alone is a band, not a hidden decimal score.
Does a bigger tablet battery guarantee a better energy class?
No. Battery capacity alone does not determine the category's energy-efficiency result.
Related FactRated pages
- Smartphone energy-efficiency classes explained
- Tablets with the longest standardized battery endurance
- Tablets rated for the most battery cycles
- Find tablets by energy class
Data source: EPREL · Last updated: Sep 7, 2026
Data source: EPREL · Last updated: Sep 7, 2026