The Anker weighs 200g against the MagFlow’s 254g. That gap is 54g, better than a quarter of the lighter bank’s whole weight. Clipped to a phone that’s already in your hand for eight hours, it’s the difference between a bank you forget about and one you keep shifting between pockets.

Thickness decides more than the scales do. The MagGo Slim measures 14.7mm front to back, on a metal frame with a liquid-silicone pad that grips the phone instead of sliding across it.

There’s an objective way to settle this. Divide capacity by weight and you get power-to-weight: the Anker carries 50mAh per gram, the MagFlow 39.4mAh per gram.

Magnetic banks score lower here than plain ones, because magnets and charging coils are dead weight. Judge these two against each other rather than against a bare 10K brick.

Darleene’s takeMy magnetic power bank lives in my scrubs pocket for a 12-hour shift. Anything that makes the pocket sag is a thing I stop carrying, and that decision gets made in about three days.

Both banks say 10,000mAh on the box, and that’s not the number to compare. Capacity in mAh only means something at a stated voltage. The honest measure is watt-hours.

By that measure the Anker holds more. Anker rates the A1664 at 38.7Wh against the MagFlow’s 36Wh, so the lighter bank is also the one carrying about 7 per cent more energy.

The 36Wh figure deserves pinning down, because third-party spec tables keep printing 37Wh. That comes from multiplying 10,000mAh by 3.7V, which assumes a single cell.

The MagFlow runs two cells in series at 7.2V, and UGREEN’s own manual and casing label both print 36Wh. Neither bank goes anywhere near an airline limit either.

International rules allow power banks up to 100Wh in hand luggage without airline approval, and at 38.7Wh and 36Wh these two sit at roughly a third of that. Check your own airline before you fly, and read the airline rules for power banks once, because the rules on where the bank travels are stricter than the rules on its size.

If you’re buying one, buy the UGREEN MagFlow. It takes the two rounds that change what the bank does for you day to day, magnetic speed and the cable you no longer have to pack, and it doesn’t give enough back on weight to lose the argument.

The Anker MagGo 10K Slim is still a strong buy, and on one condition it’s the better one. Whether you searched this as anker maggo vs ugreen magflow or ugreen magflow vs anker maggo, the deciding question is the same: which iPhone are you charging?

On an iPhone 15 or older the MagFlow’s headline speed isn’t available to you at all. Both banks sit at 15W, and the Anker is lighter, slimmer and holds more energy. At that point the choice makes itself.