OnePlus 8T Battery review: Great boosts of power

We put the OnePlus 8T through our comprehensive Battery test protocol and will present the most important results of our tests in this review.

Key specifications:

Test summary

Position in Global Ranking #8

4. Apple iPhone 12 Pro Max

9. Motorola Moto G9 Power

9. Samsung Galaxy S21 Ultra 5G (Snapdragon)

16. Samsung Galaxy S21 Ultra 5G (Exynos)

Position in High-End Ranking #2

  • Battery capacity: 4500 mAh
  • 65W charger included
  • 6.55-inch, 1080 x 2400, 120 Hz AMOLED display
  • Qualcomm Snapdragon 865 (7 nm) chipset, 5G
  • Tested ROM / RAM combination: 128 GB + 8 GB
    • Very good charging performance
    • Strong performance in on the go testing
    • Lower consumption than the competition for phone calls
    • Higher consumption than the competition for music streaming
    • Higher consumption than the competition when the smartphone is charged but still plugged in

    The OnePlus 8T showed excellent performance in our charging tests, going from a completely empty to a completely full battery in under 40 minutes, thanks to its fast 65W charger, which also brought it high marks in our 5-minute quick boost tests. However, its global battery performance was undercut by somewhat limited autonomy, with battery life lasting a bit less than two days under average conditions. As for specific use case comparisons, it did well when making phone calls and when streaming video, but did quite poorly when streaming music.

    We compared the OnePlus 8T’s performance in several key categories with two other high-end devices, the Xiaomi Mi 10T Pro 5G and the Oppo Find X3 Lite; battery capacity, charger, display type and resolution, and processor specifications for all three devices are shown in the table below.

    Autonomy (52)

    66h

    Light

    Active: 2h30/day

    45h

    Moderate

    Active: 4h/day

    28h

    Intense

    Active: 7h/day

    Both the OnePlus 8T and the Oppo Find X3 Lite achieved some 46 hours of autonomy in our typical usage scenario test versus 61 hours of autonomy from the Xiaomi Mi 10T Pro 5G.

    Worth a mention is that while its battery linearity is not quite “what you see is what you get” (as with the Oppo Find X3 Lite), the OnePlus 8T’s battery indicator is fairly accurate, as its power doesn’t drop precipitously from 20% on down as it does on the Xiaomi Mi 10T Pro.

    Gaming with the OnePlus 8T Pro

    Let’s look more closely at the OnePlus’s performance in our autonomy sub-attributes.

    Stationary

    Wiko Power U30

    Best: Wiko Power U30 (104)

    The OnePlus 8T provides 46 hours, or nearly two days in our TUS test, which places it in a dead heat with the Oppo Find X3 Lite — the difference between the two is all of 32 seconds! That said, both were left in the dust by the Xiaomi Mi 10T Pro 5G, which garnered 62 points for reaching 61 hours in its TUS test (versus 52 points for the OnePlus and 51 for the Oppo):

    Typical Usage Scenario discharge curves

    Samsung Galaxy M51

    Best: Samsung Galaxy M51 (96)

    Using a smartphone on the go takes a toll on autonomy because of extra “hidden” demands, such as the continuous signaling associated with cellphone network selection, for example. DXOMARK Battery experts take the phone outside and perform a precisely defined set of activities while following the same three-hour travel itinerary for each device.

    The OnePlus 8T battery provided an average amount of autonomy in our on the go use cases, doing better than the competition for calling and camera (and that last — camera — is especially true when compared to the Xiaomi device). That said, it trailed both the Xiaomi and the Oppo when it came to our GPS tests.

    Estimated autonomy for on the go use cases (full charge)

    Calibrated

    Samsung Galaxy M51

    Best: Samsung Galaxy M51 (100)

    For this series of tests, the smartphone returns to the Faraday cage and our robots repeatedly perform actions linked to one specific use case (such as gaming, video streaming, etc.) at a time. Starting from an 80% charge, all devices are tested until they have expended at least 5% of their battery power.

    The OnePlus 8T did very well when making 3G calls, reaching more than 28 hours (a lot of talking!). It was slightly better in 4G video streaming and video playback than the competition, but it did poorly when it came to music streaming.

    Estimated autonomy for calibrated use cases (full charge)

    Charging (94)

    Wired

    In our charging attribute, the OnePlus 8T racked up 94 points over the Xiaomi Mi 10T Pro 5G’s 79 and the Oppo Find X3 Lite’s 92. (The OnePlus and Oppo come with 65W chargers, compared to the Xiaomi’s 33W charger.)

    Full charge

    Oppo Find X3 Pro

    Best: Oppo Find X3 Pro (104)

    In the graph below, note that it is normal for charging to begin slowly as a means of protecting the battery, and is an indication that the depth of discharge was significant:

    Power consumption and battery level during full charge

    The OnePlus 8T’s total charging time from a completely empty to a completely full battery is 39 minutes, which is a little bit better than the Oppo FindX3 Lite (42 minutes), and much better than Xiaomi Mi10T Pro (1 hour 9 minutes) — unsurprising, again because of the big difference in chargers.

    Quick boost

    Oppo Find X3 Neo

    Best: Oppo Find X3 Neo (95)

    By plugging in the OnePlus device for 5 minutes when it has a battery charge under 50%, users will gain more than 5 hours of autonomy. Perhaps of greater interest to gaming fanatics, at least, is that when its battery is near death’s door, the 8T needs only 17 seconds to gain 1% of battery life — and that is the quickest charge of the three devices: the Oppo comes in a relatively close second (24 seconds), but it takes the Xiaomi 2.5 minutes for 1% more power.

    Efficiency (77)

    The DXOMARK power efficiency score consists of two sub-scores, Charge up and Discharge rate, both of which combine data obtained during robot-based typical usage scenario testing, outdoor mobility testing, charging evaluation, and power measurements, and then take into consideration the device’s battery capacity.

    Oppo Find X3 Neo

    Best: Oppo Find X3 Neo (82)

    Apple iPhone 12 Pro Max

    Best: Apple iPhone 12 Pro Max (116)

    The OnePlus 8T’s overall discharge rate during active hours is slightly higher than the competition’s, although its nighttime discharge rate is in line with the competition. It shows considerably lower use of power than the competition when making 3G calls.

    Conclusion

    The OnePlus 8T with its 65W charger provides both overall fast charging and great quick boosts of power. Where it falls a bit short is in autonomy, particularly in comparison with the Mi 10T Pro, where the 8T lags behind by more than half a day in average use. However, the tradeoff between autonomy and charging among the three phones results in a virtual tie, with the OnePlus only one point behind the Xiaomi and 3 points ahead of the Oppo in the high-end segment.

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