Anker 737 vs Anker Prime 220W

The Anker 737 and Anker Prime 220W are both flagship travel batteries, and both clear the 100 Wh airline carry-on line without issue. But they’re built around different bets. The 737 bets on capacity. The Prime bets on speed. Which one you should pick really depends on which problem you run into first: running out of charge, or waiting too long for it to fill back up.

Capacity is the 737’s clearest advantage, and it isn’t small. At 24,000 mAh (88.8 Wh), it holds about 20% more energy than the Prime’s 20,100 mAh (72.36 Wh). That’s roughly one extra full phone charge, or another 10 to 15% of a laptop battery. For a two-day trip where you recharge the bank every night, that gap barely registers. For a longer stretch without a reliable outlet, camping, a packed conference day, an overnight international flight, the 737’s extra reserve is what buys you the extra hours.

Output speed is where the Prime pulls ahead, and it’s not close. Each USB-C port delivers up to 140W on its own, with a combined ceiling of 220W, so a 140W MacBook Pro and a second device can both charge at full tilt at the same time. The 737 tops out at 140W total, split down to about 60W per port when both are in use. That’s plenty for a MacBook Air or a typical ultrabook. It’s not enough to unlock the full charging speed of a MacBook Pro 16-inch or a high-performance Windows laptop built for a 96W to 140W charger. For those machines, the Prime’s higher per-port ceiling wins the charge, full stop.

Recharging tells a similar story. The Prime accepts up to 100W over USB-C and can refill itself in about 45 minutes from a 100W wall charger. The 737’s 65W input takes noticeably longer to recover the same capacity. This matters most in the gaps between things, a layover, a break between meetings, a quick hotel check-in, where you plug in and unplug again almost right away. In those short windows, the Prime simply catches up faster.

Weight and display close out the comparison. At 1.12 lbs (510 g), the Prime is 270 g lighter than the 737’s 1.72 lbs (780 g), which shows up fast in a bag you’re already stuffing with a laptop and cables. Its smart display and Bluetooth app show real-time wattage, remaining percentage, and which port is drawing what. The 737 just gives you a rough LED quartile reading, better than nothing, not much more. If you own a power-hungry laptop and want fast charging plus a faster self-recharge in a lighter shell, get the Prime. If raw capacity and the extra runway it gives you over several days matters more, the 737 still holds more total charge.