Battery test overview
The battery test is intended to be run starting from a fully loaded battery until the battery is completely run down. It appears to target a certain fixed level of CPU processing that is sustained throughout the test. In the test results, a duty cycle parameter is given for several time points, which more or less represents CPU utilization. Slower CPU cores (such as quad-core Cortex-A7-based SoCs) have a higher duty cycle percentage, while high-performance "big" cores such as Cortex-A57 and Krait-400 show a lower percentage.
In practice, most battery test results in the Geekbench database were terminated early in the benchmark process and do not give useful information. The test runs that completed a full run-down from 100% to close to 0% battery do give a usable indication of battery efficiency. The benchmark expresses battery performance as a number, similar to Geekbench CPU performance scores. This score is correlated with the duration and duty cycle using a certain formula, reflecting the amount of CPU work done and the battery running time. The score is heavily influenced by the actual capacity of the battery used in the device.
Overview of results for common SoCs
The following table shows Geekbench approximate battery test scores for common SoCs used in smartphone models for which a battery capacity specification is available. The table is ordered by SoC model name.
Device SoC Score Capacity Duration Score / (Range) (mAh) (hrs:min) mAh Apple iPhone 5S Apple A7 1220-2090 1560 2:00-3:30 0.78-1.34 Apple iPhone 6 Apple A8 1550-2360 1810 2:35-4:00 0.86-1.30 Apple iPhone 6 Plus Apple A8 2580-3250 2915 4:20-5:25 0.89-1.11 Meizu MX Pro Exynos 5430 2080-2730 3350 7:45-10:10 0.62-0.81 Samsung Galaxy Alpha Exynos 5430 1850-2710 1860 4:30-5:00 0.99-1.46 Samsung Galaxy Note 4 Exynos 5433 3190-3650 3220 5:20-6:00 0.99-1.13 Samsung Galaxy S6 Edge Exynos 7420 4100-4600 2600 7:00-7:45 1.58-1.77 Huawei Honor 6 Kirin 920 1580-2080 3100 2:40-3:30 0.51-0.67 Huawei Mate 7 (MT7-L09) Kirin 925 2470-2820 4100 4:05-4:20 0.60-0.69 Huawei P8 (GRA-L09) Kirin 930 3270-4150 2680 5:30-7:00 1.22-1.55 Lenovo A5000 MT6582 3740 4000 14:00 0.94 Xiaomi Redmi Note MT6592 2850-3560 3200 7:30-9:00 0.89-1.11 Huawei G750-U10 MT6592 2960-3430 3000 7:45-9:00 0.99-1.14 Meizu MX4 MT6595 2540-2780 3100 6:20-6:55 0.82-0.90 Lenovo A7000-A MT6752M 4550-4950 2900 8:16-8:50 1.57-1.71 Meizu M1 Note MT6752 4900-6310 3140 8:10-10:30 1.56-2.01 HTC Desire 820s MT6752 3580-3730 2600 6:15-6:30 1.38-1.43 HTC One E9+ MT6795 3370 2800 6:00 1.20 Moto G MSM8226 (SD400) 1600-2000 2070 6:00-7:30 0.77-0.97 Xiaomi Redmi 1S MSM8226 (SD400T) 1485 2000 5:30 0.74 Lenovo A6000 MSM8916 (SD410) 2700 2300 6:50 1.17 HTC Desire 826 MSM8939 (SD615) 1800 2600 4:25 0.69 Xiaomi Mi 4i MSM8939 2520-2810 3120 5:50-7:30 0.81-0.90 HTC One M8 MSM8974 (SD801) 2500-3300 2600 4:20-5:50 0.96-1.27 Xiaomi Mi 4 MSM8974 3150 3080 7:45 1.02 Samsung Galaxy Note 4 APQ8084 (SD805) 2500-3550 3220 4:10-6:15 0.78-1.10 LG G4 MSM8992 (SD808) 2500-3260 3000 4:15-5:30 0.89-1.09 HTC One M9 MSM8994 (SD810) 1400-2580 2840 2:20-4:20 0.49-0.91
Devices with low processing power but long battery life may be penalized by having to power the screen and wireless connectivity for a longer period during the test.
The ratio of the battery score and the battery capacity (in mAh) gives a very rough indication of the efficiency of a particular CPU architecture, although the comparison may be skewed by several factors.
Results by SoC type
The previous generation of Cortex-A7-based SoCs such as Snapdragon 400 and MT6582 shows long running time due the effiency of the Cortex-A7 core, but the battery score appears to be affected by the limited CPU power. Snapdragon 410 does relatively well despite (or perhaps thanks to) being limited to ARMv7 mode.
SoCs with previous generation Cortex-A15 cores for performance in a big.LITTLE configuration, such as Kirin 920/925, show relatively low efficiency, as is to be expected given the relatively high power consumption Cortex-A15 is known for. Exynos 5430, which is manufactured on a relatively advanced 20 nm process, generally does better.
Octa-core mid-range: MediaTek does well
Among octa-core mid-range SoCs such as the Cortex-A53-based MT6752 and Qualcomm's Snapdragon 615 and MediaTek's previous-generation Cortex-A7-based MT6592, both the MT6752 and MT6592 make a strong showing, with MT6752 getting particularly high scores.
MT6752 has an optimized memory architecture with a 32-bit memory interface and is manufactured on TSMC's 28HPM process, which helps performance relative to Snapdragon 615. Although not tested by Geekbench, reports indicate that wireless standby power efficiency is not as great as the CPU efficiency for this SoC. It is possible that due to the CPU cores being optimized for relatively heavy CPU loads (not big.LITTLE so no cores optimized for low power consumption at low frequencies), which includes the Geekbench battery test, a low load scenario (such as reflected in standby time) produces less optimal power consumption.
Qualcomm's Snapdragon 615 (MSM8939) does relatively poorly, which can largely be explained by the assymmetric CPU configuration and lower-performance 28LP manufacturing process.
Performance segment SoCs
The poor performance of Snapdragon 810 (as illustrated by the HTC One M9) is apparent, with significant worse battery efficiency than the previous generation Snapdragon 801 and 805. Snapdragon 808, which uses a later revision Cortex-A57 core and is used inside the LG G4, does somewhat better.
Largely due to the relatively advanced manufacturing process (14 nm FinFET for Exynos 7420), Samsung's latest SoCs do well, particularly Exynos 7420 used inside the Galaxy S6. Even Samsung's previous generation Exynos 5433 appears to be well ahead of Snapdragon 810 in terms of efficiency.
A limited number of results is available for two Cortex-A53-based performance SoCs (characterized by a wide memory interface and more powerful GPU than mid-range solutions), MediaTek's MT6795 (Helio-X10) and HiSilicon's Kirin 930. Kirin 930 shows relatively good efficiency in this benchmark, possibly ahead of MediaTek's MT6795. Kirin 930 has a two-level hierarchy in which one cluster of Cortex-A53 cores is optimized for a higher and the other for a lower frequency, while in MT6795 all cores can reach the maximum frequency.
Source: Geekbench Browser (Battery search)
Updated 28 May 2015.