unable to charge my surface pro.

Useful mostly for traveler and using so many electronics

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I bought this because of its massive storage, 40000MA. As its power delivery is 30Watt, this is fine for phone charging,but is slow if you want to charge a computer. Note that a laptop running ideal takes between 12 to 30 watt when doing casual work. Mac M processors take less which means this one charges my Mac Book 16 inch with with M1 Max processor. Note that when the M1 Max when running at its maximum speed, it consumes up to 80 watt meaning, 30 watt will just extend the battery life and not charge the computer. For for most use, my M1 Max uses around 20 watt when browsing the internet and doing casual work.Then what is the issue. The issue in this batter is once you use it at its 30 watt limit, it becomes so hot from the front. This means, if you have a computer and using it for charging, the 40,000 MA become around 20,000 as around half the energy is wasted as heat. So, why to carry that weight. Get a 20,000MA with 40 to 65 watt or more power delivery and you will have the same usable power. This answer why people complain about the short power of this massive power bank.So, this power bank is only recommended for charging phones and small tablets or low powered devices like camera. Use it for devices that need maximum of 15 watt and it will work fine. Even when you charge it at 30 watt, it becomes hot. This model should be discontinued and replaced with higher power delivery ones. Some models today go up to 240 watts. Even if we do not need more than 100 watt for any computer charge, a power bank should not run hot to conserve its energy.

Very Good for camping

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