Using a Lower-Wattage Charger for my Surface Laptop

Quizmaster 0 Reputation points
2026-07-05T20:36:47.7566667+00:00

I have various Surface Connect chargers from previous Surface devices I’ve owned, all varying in wattage. The lowest I have is a 31 W charger, the highest being a 65 W charger. My Surface Laptop 4 has a minimum wattage requirement of 60 W for charging. Is it still OK for me to use any charger to charge my device? In other words, if I used a lower-wattage charger that recommended, will it damage my device?

Surface | Surface Laptop | Power and battery
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  1. Alexandr S 105.4K Reputation points Independent Advisor
    2026-07-06T00:36:00.01+00:00

    Hello, Quizmaster.

    The battery of each device is designed and equipped for specific specifications. And although modern batteries use protective equipment, it is still not recommended to use a power supply with other characteristics. As the AI has already said, this will not harm the battery in a short time, but its service life will decrease. So it's best to use either a "native" power supply, or a very similar one in terms of characteristics.

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  2. AI answer

    2026-07-05T20:37:38.0633333+00:00

    Using a lower‑wattage genuine Surface power supply will not damage a Surface Laptop 4, but it may charge slowly or not at all.

    From the charging requirements:

    • Surface Laptop 4 is listed under “Devices that charge using USB-C or Surface Connect” with:
      • Minimum wattage: 60W
      • Recommended wattage for Fast charging: 60W
      • Microsoft power supply: Model 1706, 60W (15V @ 4A).

    What this means in practice:

    • A lower‑wattage charger (for example, 31W or 39W) generally will not harm the device if it is a genuine Microsoft or Microsoft‑licensed Surface charger.
    • However, because it does not meet the 60W minimum, the laptop may:
      • Charge very slowly, or
      • Not charge at all while in use (battery may still drain if workload is high), and
      • Not support Fast Charging.

    Microsoft also notes for USB‑C PD charging that if a lower‑wattage charger is used, the device “may charge slowly or not at all” and won’t use Fast Charging, and recommends using a charger that provides the recommended wattage.

    So:

    • Using the 65W Surface charger is fully appropriate and meets/ exceeds the 60W requirement.
    • Using 31W or other sub‑60W Surface chargers is not recommended for regular use because they do not meet the minimum power requirement, but they are not expected to damage the device; they may simply be ineffective or very slow.

    For best performance and to ensure reliable charging, use a genuine Surface power supply that meets the 60W requirement (such as the 60W Model 1706) or a USB‑C PD charger that provides at least 60W.

    References:

    AI-generated content may be incorrect. Read our transparency notes for more information.

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