High-capacity power banks of 20000 mAh and above suit anyone who needs several phone charges, or extra power for a tablet or laptop, between wall sockets. Our range has over 100 models, with brands such as Anker, Belkin, Baseus, Xiaomi and Vention, in versions with one or several USB-C and USB-A ports.
How to choose a high-capacity power bank
Capacity. Our range starts at 20000 mAh and includes some 25000 and 27000 mAh models. Some listings give watt-hours instead: 74 Wh is roughly equal to 20000 mAh. Usable energy is always lower than the label suggests because of conversion losses, so treat the figure as a ceiling.
Ports and output. Many models in our range have one or two USB-C ports and one or two USB-A ports, and some can power up to four devices at once. If you plan to charge a laptop, you need a USB-C port with enough wattage for it, so compare the power bank's output with the rating on your laptop charger.
Recharging. Most power banks here take their input through USB-C, while a few still use Micro-USB. A large battery takes many hours to refill on a basic charger, so USB-C input with fast charging saves a lot of waiting. A few models can also charge from solar, but a solar panel only gives a slow top-up.
Travel limits. Most airlines allow power banks up to 100 Wh in hand luggage and ban them from the hold. A 20000 mAh unit sits at about 74 Wh, so it is normally fine, but check your airline's rules for larger models.
Size and weight. A big battery cell makes the unit noticeably heavier than a phone. For daily carrying in a bag this matters more than a few extra thousand mAh.
Power bank brands we carry
- Anker: a specialist in charging products, known for its PowerCore power banks and fast chargers.
- Belkin: known for charging accessories designed with Apple devices in mind.
- Baseus: makes power banks together with cables and wall chargers, often with several fast-charging ports.
- Xiaomi: sells the Mi Power Bank series, which is popular for its large capacities.
- Xtorm: a Dutch brand that focuses on power banks, including solar and outdoor models.
- Vention: best known for cables and adapters, and sells power banks alongside them.
- Sandberg: a Scandinavian maker of computer and mobile accessories.
- SBS: an Italian brand specialising in mobile phone accessories.
Also in our range: Rivacase, Dudao, Intenso and Canyon.
Frequently asked questions about high-capacity power banks
How many times can a 20000 mAh power bank charge a phone?
A 20000 mAh power bank typically charges a modern smartphone about three to four times. The exact number depends on the phone's battery size and on conversion losses, which reduce the usable capacity. A phone with a smaller battery will get more charges.
Can I take a 20000 mAh power bank on a plane?
Yes, in most cases you can carry it in your hand luggage. A 20000 mAh power bank is around 74 Wh, below the 100 Wh limit that most airlines apply. Power banks should not go in checked baggage, and rules differ between airlines, so check yours before you travel.
Can a power bank charge a laptop?
Only if it has a USB-C output with enough power for your laptop. Many laptops need more than a typical phone fast charger delivers, so check the wattage on your laptop's charger and compare it with the power bank's output. A lower-powered bank may still work, but it will charge slowly or may not keep up with the laptop's use.
How long does a high-capacity power bank take to recharge?
It usually takes several hours, and often more than four even with fast USB-C charging. A basic 5 V charger or a Micro-USB input takes considerably longer. For the shortest wait, pick a model with USB-C input and use a wall charger that supports fast charging.
