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A low battery on your smartphone, tablet, or laptop is more than just an inconvenience—it can disrupt your workflow or limit your connectivity while travelling. A powerful 20000mAh power bank offers a reliable solution to keep multiple devices energised over long periods.
This guide is designed to help you navigate your options. It highlights the key technical features to consider when choosing an external battery and presents a selection of models suited for various use cases based on their specifications.
A capacity of 20000mAh is a great starting point, but other technical details determine a model's real-world performance.
While capacity tells you how much energy can be stored, the output power in watts (W) determines how quickly that energy is delivered to your devices. For many users today, a power bank with fast charging is a fundamental requirement. Look for standards like Power Delivery (PD), which is delivered via the USB-C port, or Quick Charge (QC). Models with a high wattage (e.g., 45W or more) can do more than just act as a mobile charger for your phone; they can also power more demanding devices, serving as a power bank for a laptop, provided it supports USB-C charging.
Consider how many and what types of devices you need to charge simultaneously. Modern power banks offer a combination of USB-A and USB-C ports. A bidirectional USB-C port is especially convenient, as it can be used to both charge the power bank itself and power other devices. For a travel power bank, the ability to charge two or three devices at once is a crucial advantage.
High capacity inevitably comes with increased weight and larger dimensions. A 20000mAh power bank typically weighs between 350 and 500 grams. You'll need to weigh whether the large energy reserve is more important to you than maximum pocket-friendly portability. However, for a backpack or laptop bag, this size is usually a good compromise.
Here is a curated selection of models that stand out for their technical specs and specific features.
What makes it stand out: The Varta Powerbank is synonymous with solid build quality and reliable technology. With four ports, including a bidirectional USB-C port, it offers great flexibility. According to the manufacturer, its "Varta Advanced Safety Technology" ensures a safe charging process.
Advantages:
Who it's for: This model is an excellent choice for users looking for a versatile and robust power bank from an established brand for daily use and travel, capable of reliably charging multiple devices like smartphones and tablets.
What makes it stand out: The Samsung Powerbank distinguishes itself with its exceptionally high charging output of up to 45 watts. It supports standards like Power Delivery 3.0 and Samsung Super Fast Charging 2.0. This allows compatible devices, including some laptops, to be charged in significantly less time.
Advantages:
Who it's for: Ideal for users who prioritise maximum charging speed. Owners of fast-charging-capable Samsung devices or those who need a power bank for laptop models with USB-C charging will particularly benefit from its high performance.
What makes it stand out: While this model from Baseus offers a lower capacity at 10,000 mAh, it shines with a unique feature: integrated charging cables (USB-C and Lightning). This makes it extremely practical for on-the-go use, as there's no need to carry separate cables.
Advantages:
Who it's for: Perfect for users seeking a lightweight, pocket-friendly power bank for their daily commute or short trips, who value the convenience of integrated cables.
The right power bank is only one part of your charging setup. To take full advantage of its speed or to connect older devices, you might need specific cables. A good selection of accessories ensures you're prepared for any situation.
Explore our selection of high-quality USB-A charging cables to complete your kit.
The number of charges depends on your smartphone's battery capacity and the energy loss during transfer (typically 20-30%). A 20000mAh power bank has a real-world usable capacity of about 13,000-14,000 mAh. A modern smartphone with a 4,500 mAh battery can therefore be fully charged about 2.5 to 3 times.
Yes, this is generally permitted. Airlines limit the capacity of lithium-ion batteries in carry-on luggage to 100 watt-hours (Wh). A 20000mAh power bank (at a typical nominal voltage of 3.7V) has a capacity of 74 Wh (20 Ah × 3.7 V = 74 Wh), which is well below the limit. They are prohibited in checked baggage. It is always recommended to check with your specific airline before travelling.
Power Delivery (PD) is a universal fast-charging standard that works over a USB-C connection. It allows for a flexible and significantly higher power output than the older USB-A standard. A power bank with PD can intelligently negotiate the charging voltage and current with the connected device to charge it as quickly and safely as possible. This is especially important for charging larger devices like tablets and laptops.