The Anker Zolo Power Bank (20K, 30W) is a 20,000mAh battery with a USB-C cable built into the body. It suits long travel days, because Anker says it charges an iPhone 15 up to 4 times. The built-in cable is designed to withstand over 10,000 bends Anker.
Anker Zolo 20K at a glance
20,000mAh
Capacity
30W
Max output
5.98inches
Built-in cable
318g
Weight
Anker lists these specs on its product page and in the user guide for model A1689 Ankermanual.
Capacity
20,000 mAh
Max output
30W
Input
20W max
USB-C output
30W max
USB-A output
22.5W max
Total output, both at once
15W max
Ports
Built-in USB-C cable, USB-C port, USB-A port
Built-in cable
5.98 inches
Cable bend rating
Over 10,000 bends
Weight
318 g
Size
11.99 x 7.34 x 3.15 cm
Recharge time
About 2.5 hours with a 20W charger
Pass-through charging
Yes
Model
A1689
How much does the Anker Zolo 20K weigh?
Anker lists 318 g, and a size of 11.99 x 7.34 x 3.15 cm Anker. By our maths, 318 g is about 11.2 oz (318 divided by 28.35).
How many phone charges does 20,000mAh give?
Anker says up to 4 charges for an iPhone 15, or 3.79 charges for a Samsung S24 Anker. Anker also says 30W output takes an iPhone 15 from 0 to 57% in 30 minutes.
How long does the Anker Zolo take to charge?
About 2.5 hours with a 20W fast charger Anker. The user guide lists the input as 20W max, through the built-in cable or the USB-C port manual.
Anker Zolo 20K 30W or 20K 45W?
Pick the 30W version for the lighter body at 318 g. Anker also sells a 20,000mAh Zolo with 45W output and two built-in USB-C cables, at 420 g Anker.
→You want 45W output: pick the Zolo 20K 45W Anker.
→You want a smaller battery: pick the Zolo 10K 30W Anker.
→You want magnetic wireless charging: pick the Zolo Magnetic 10K Anker.
Good to know before you buy
!
Anker recalled model A1689 in June 2025. Anker asks owners to stop using an affected unit and to check the serial number on its recall page AnkerAnker. Anker offers a refund or a gift card for a unit that qualifies.
!
Both ports at once share 15W. The user guide lists a total output of 5V at 3A, 15W max manual. Use the USB-C side alone for the full 30W.
!
The box holds the power bank and a welcome guide. Anker does not list a wall charger in the box Anker. Use a 20W charger to get the 2.5 hour recharge.
!
The built-in cable is 5.98 inches. That keeps the phone close to the power bank. For more room, plug a longer cable into the USB-C port Anker.
!
Earbuds need trickle-charging mode. Press the Power button twice, then charge the earbuds through the USB-A port manual.
Note
Anker's recall covers five models, A1647, A1652, A1257, A1681 and A1689. Check your serial number at anker.com/rc2506.
How the Anker Zolo 20K compares
We compared the Zolo 20K with two other Anker power banks that have a cable built in. Every number here comes from Anker's own pages.
Anker Zolo 20K vs Anker Zolo 10K
The 20K holds twice the capacity, and the 10K has a shorter built-in cable at 5.4 inches. Anker says the 10K gives an iPhone 15 about 1.67 charges, against up to 4 charges from the 20K Anker.
Anker fits the Zolo 20K with ActiveShield 2.0. Anker says it monitors temperatures 3 million times per day and adjusts power output Anker. Anker also says the cells are upgraded and CB-certified, and meet international safety standards for quality.
Anker ran a voluntary recall on this model in June 2025 Anker. Anker says a potential manufacturing issue involved lithium-ion cells from a single vendor. Anker adds that affected serial numbers hold no letter "O" or "I" Anker. Anker asks owners to keep the unit until it confirms that the unit qualifies.
What the built-in cable does
The built-in USB-C cable charges your phone, and it also refills the power bank. Anker's user guide lists the same cable under both input and output manual. So one cable covers both jobs, and you can leave your own cable at home.
Anker measures the cable at 5.98 inches, and says it is designed to withstand over 10,000 bends Anker. That length keeps the phone close to the power bank in a bag.
There are two more ways in and out. A USB-C port takes your own cable, at up to 30W, and a USB-A port gives up to 22.5W manual.
Can you take the Anker Zolo on a plane?
Yes. Anker says power banks under 27,027 mAh, which is 100 watt-hours, can be legally and safely carried on planes Anker. The Zolo 20K holds 20,000 mAh, so it sits under that figure. Read your airline's own rules before you fly.
How to tell if the Anker Zolo is charging
The display shows the remaining battery percentage, and a separate icon for recharging manual. A third icon on the display shows trickle-charging mode. So one look at the screen tells you the level and whether power is going in.
The user guide also notes that Anker ships two logo versions of this power bank at random. It says the function of the product stays the same.
How to set up and use it
These steps come from Anker's user guide for the A1689 manual.
Check the display for the remaining battery percentage.
Recharge the power bank through the built-in USB-C cable, or through the USB-C port.
Use a 20W charger to fill it in about 2.5 hours.
Charge a phone or tablet with the built-in USB-C cable.
For a second device, plug your own cable into the USB-C port or the USB-A port.
For earbuds, press the Power button twice to start trickle-charging mode.
Charge the earbuds through the USB-A port.
Press the Power button twice again to leave trickle-charging mode.
Tip
Pass-through charging works, so the power bank can recharge while it charges your phone.
Care and quick fixes from the manual
How to recharge it
Use the built-in USB-C cable, or the USB-C port manual. The user guide lists the USB-A port under output, so power goes out of that port, not in.
If your earbuds will not charge
Press the Power button twice to start trickle-charging mode, then use the USB-A port manual. Small devices draw a low current, and this mode is built for them. Press the Power button twice again to leave the mode.
If charging is slower than you expect
Check what else is plugged in. The user guide lists 30W max from the USB-C side and 22.5W max from the USB-A port manual. It lists 15W max when both run at once. Unplug the second device to get the full 30W.
If your unit is part of the recall
Stop using it, and check the serial number on Anker's recall page Anker. Anker asks you to register, and to keep the power bank until Anker confirms that your unit qualifies. Anker then offers a refund or a gift card.
Anker Zolo FAQ
Why was the Anker Zolo recalled?
Anker recalled five power bank models in June 2025, and A1689 is one of them Anker. Anker says the cause was a potential manufacturing issue with lithium-ion cells from a single vendor Anker.
Can it charge two devices at once?
Yes. The USB-C side and the USB-A port both work at the same time. The user guide lists a total output of 5V at 3A, 15W max manual.
What is in the box?
Anker lists the power bank, a welcome guide, an 18-month warranty and its customer service Anker.
Does the Anker Zolo have a Lightning cable?
No. This model has a USB-C cable built in Anker. Anker sells a separate 10K Zolo with a built-in USB-C cable and a built-in Lightning cable Anker.
How much does the Anker Zolo cost?
See today's price with the link above.
The verdict
4/4 PASS
No. 024 · Anker Zolo Power Bank 20K
Long travel days and a phone that dies.
The Anker Zolo Power Bank (20K, 30W) suits a long travel day with one phone and a set of earbuds. You get 20,000 mAh and 30W from the USB-C side. You also get a cable built into the body, and a screen that reads out the percentage left. Before you buy, check the serial number against Anker's June 2025 recall for model A1689.
4/4 PASS
