Most power banks are built for phones. The Anker 737 Power Bank (also sold as PowerCore 24K) is built for laptops: it can deliver up to 140W from a single USB-C port, enough to charge many ultrabooks and even some larger 16-inch laptops at full speed. It also has a small display that shows exactly what’s happening. Here’s what it offers, what to watch for and who it suits, based on its specifications and widely reported owner experience.
Verdict
Buy it if you need to charge a USB-C laptop away from outlets — on flights, at events or in coworking spaces. Skip it if you only charge phones and earbuds; a smaller 10,000–20,000mAh bank is lighter and cheaper.
At a glance
| Capacity | 24,000mAh (roughly 86 Wh — under the common 100 Wh airline carry-on limit) |
| Max output | 140W from one USB-C port (USB Power Delivery 3.1) |
| Ports | 2× USB-C, 1× USB-A; output is shared when charging several devices |
| Recharging | Up to 140W input with a compatible charger for fast refills |
| Display | Shows battery percentage, input/output wattage and estimated time |
| Weight | Around 630 g (1.4 lb) — noticeably heavy |
Strengths
- Real laptop power: 140W output covers most USB-C laptops, including MacBook Pro models that support fast charging over USB-C.
- Useful display: seeing live wattage tells you whether a cable or device is actually fast charging.
- Fast recharge: with a high-wattage USB-C charger, the bank refills far quicker than typical power banks.
- Three ports: charge a laptop, phone and earbuds together.
Things to know
- Capacity isn’t a full laptop charge multiplier. Energy is lost in conversion; expect roughly one full charge for many thin laptops, less for large ones.
- You need the right cable: 140W requires a USB-C cable rated for 240W (EPR). A standard 60W cable limits speed.
- Your laptop must charge over USB-C PD. Many gaming laptops with barrel-plug chargers can’t charge from it, or only charge slowly.
- Weight: it’s closer to a small charger brick than a pocket power bank.
- Air travel: keep it in carry-on luggage and check your airline’s rules.
Who it’s for
| You are… | Good fit? |
|---|---|
| A frequent flyer with a MacBook or USB-C ultrabook | Yes |
| A photographer or creator charging cameras, drones and laptops | Yes |
| A student who mostly charges a phone | Overkill |
| A gaming laptop owner with a barrel charger | Check USB-C charging support first |
Compare alternatives in our guide to the best power banks for laptops, and pick a matching wall charger from our USB-C laptop charger guide.