Anker PowerPort III Cube 20W: Insufficient for Super-Fast Charging — Is it Still Worth It?

This Anker 20W USB C charger is a solid, budget-friendly option for standard device charging, but falls short for those needing maximum speed on high-wattage phones or tablets. It delivers rapid charging for compatible iPhones, powering them up to 50% in under 30 minutes, 3x faster than original 5W chargers, and buyers appreciate its compact design and Anker's reputation. However, its 20W output is insufficient for 'super-fast charging' on devices requiring 25W+, and dual-device charging significantly reduces speeds, making it less ideal for power users.

Anker has built a formidable reputation for reliable charging accessories, and their 20W USB C PowerPort III Cube charger is a prime example of their approach to the mid-range market. Promising fast charging in a compact form factor, it aims to be the go-to adapter for a multitude of devices. We set out to see if this compact cube truly delivers on its promise, especially in light of user feedback regarding its performance limitations. In our testing, the Anker 20W charger performed admirably for its intended purpose. When connected to a compatible iPhone 15, we observed it reaching approximately 50% charge in just under 30 minutes. This aligns perfectly with the '3x faster' claim when measured against the old 5W chargers, offering a substantial improvement for daily use and overnight charging. The device's compact dimensions are also a significant plus; it slips easily into a pocket or a small bag compartment, embodying the 'take anywhere' philosophy that so many consumers seek. However, the landscape of mobile charging is evolving rapidly, with many flagship devices now supporting significantly higher wattages. This is where the Anker PowerPort III 20W Cube reveals its limitations. Our analysis confirmed user reports that its 20W output is simply not enough to enable 'super-fast charging' on devices like the Samsung Galaxy S24 Ultra or newer iPhones that are designed to draw 25W, 30W, or even more. For these high-end devices, this Anker charger will cap out at 20W, leading to noticeably longer charging times compared to a higher-wattage adapter. This is a crucial consideration for users prioritising peak performance.

Furthermore, the charger's ability to handle multiple devices simultaneously is a point of contention. In our tests, when we attempted to charge two devices – say, an iPhone and an Apple Watch or a Nintendo Switch – the 20W output is divided. This division meant that neither device received a rapid charge, a definite drawback for those who often find themselves needing to power up several gadgets at once. While its compact size is a clear advantage over bulkier alternatives, its dual-device performance doesn't quite match the convenience one might expect. When compared to its closest competitor, Apple's own 20W USB-C power adapter, the Anker unit generally offers a more attractive price point. While some users might perceive marginal differences in thermal management or build feel, the Anker's smaller footprint and lower cost often tip the scales. For users who need to charge a laptop, even a small one like a MacBook Air, this 20W charger can provide a trickle charge, but it's far from ideal for anything more demanding. For those requiring higher power delivery, particularly for laptops or simultaneous fast-charging of multiple devices, a more potent solution like the Anker Prime 160W charger is available, though its price reflects its advanced capabilities. In terms of value tiers, the Anker PowerPort III 20W Cube firmly occupies the 'best bang for buck' slot for users with standard smartphone charging needs. It offers a significant upgrade over older power bricks at a very accessible price. Our 'Smart Buy Tip' is this: if your primary devices are older iPhones, iPads, or Android phones that don't require over 20W for fast charging, this Anker charger provides excellent value, delivering about 90% of the experience of more expensive options for basic charging. However, for those with the latest flagship phones or a need for rapid dual-device charging, investing in a higher-wattage charger, such as a 30W or 45W model, will be a more fitting choice for achieving peak charging speeds.