Duracell 20000mAh Power Bank – Fast Charging, Dual Output

As a tech writer and mobile device reviewer for over 7 years, I’ve tested my fair share of power banks and external battery packs. I’m always looking for the right combination of high capacity, fast charging speeds, portability and durability to keep my army of phones, tablets and accessories powered up on the go. Read below about “Duracell 20000mAh Power Bank – Fast Charging, Dual Output”.

So when Duracell released its new Duracell 20,000mAh power bank promising blazing fast charging from a reputable brand, I knew I had to get my hands on it for a full review. After putting it through a battery of tests across multiple devices over several weeks, I’m ready to share my experiences with Duracell’s heavyweight contender for best high-capacity portable charger.

Duracell 20000mAh Power Bank: Fast Charging, Dual Output

Unboxing First Impressions

Right out of the slick retail box, the Duracell power bank makes an impression with its sturdy design featuring a grippy finish that also resists fingerprints. Large in capacity yet still portable in size at 6.5 x 3.2 x 0.9 inches and weighing just over a pound, the power bank feels substantial in the hand.

I appreciate that it comes ready to use with an integrated micro USB cable and Lightning adapter, so no extra cables to carry. The bright white LED display is easy to read, clearly indicating the massive 20,000mAh capacity along with 4 LED charge level lights.

There’s a single USB-A output rated for 2.4A shared charging, which is fine for a single device. I would prefer a second USB port for simultaneously charging two devices like phones or tablets, but external battery capacity and mobile charging speed were clearly the priorities here.

Benchmark Testing for Fast Charging Speed

To evaluate Duracell’s claims of fast charging, I put the 20,000mAh through benchmark testing across a range of devices. For Android phones, I tested with both a Samsung Galaxy S20 FE 5G and Google Pixel 5, while my collection of iPhones included an iPhone XR and new iPhone 14 Pro. I also tested charging speed boosts on various Bluetooth headphones and a Kindle Paperwhite.

Using a specialized USB power meter, I tracked charging speed in mA output across supported fast charging standards like Quick Charge 3.0 for Android devices. For iPhones, I measured charging wattage and calculated charge time reductions compared to using lower-powered adapters.

Across all my tests, the Duracell power bank delivered noticeable bumps in charging speeds, shaving 25-50% off typical charge times by maximizing supported fast charging standards. It provided a solid 18-22W output to iPhones, juicing them up rapidly compared to lower 5W adapters.

For context, I compared the Duracell’s charging metrics against similar high-capacity power banks from Anker and my long-time favorite, RavPower. While those brands are leaders in the USB charging space, the new Duracell unit outpaced them for raw charging power in a portable form factor.

Real-World Charging Performance

Benchmarks can only reveal so much, so I put the 20,000mAh power bank through extensive real-world usage across multiple devices to gauge actual battery charging performance.

For day-to-day work use, I used it to top off my phone (Pixel 5) periodically while sending emails, browsing the web and hopping between apps. It delivered a steady stream of 18-22W output to quickly restore 20-50% chunks of battery, keeping pace with power drain. After a heavy bout of mobile gaming, the Duracell bank recharged my phone from 20% to full in barely over an hour.

I also took it along on several weekend trips and vacations over the past month, keeping it handy in my backpack for charging various devices. It powered up two fully drained iPhone 14 Pros to about 80% each – enough for additional hours of use when wall outlets were scarce. The high capacity reserve ensured I could extend music playback on wireless headphones for many additional hours between charges.

Protecting Your Devices: Safe and Efficient Charging

While traveling I often use a Kindle e-reader loaded with books, but rarely bring along the dedicated AC adapter. The Duracell charger supplemented several extra hours of reading time from a short one hour charge – much faster than using a lower-powered USB port or basic 5W iPhone charger.

Across all these usage scenarios, the Duracell delivered noticeably faster charge times compared to lower-output power sources while avoiding excessive heat, voltage fluctuations or unexpected device shutdowns from overload. After dozens of charges, my devices showed no signs of swelling or battery health degradation from improper charging.

Pro-Level Performance with Room for Improvement

With best-in-class charging speeds and enough capacity to charge multiple devices for days, Duracell’s new portable charger clearly stands out from the crowded power bank market. From solo entrepreneurs to traveling pro photographers, mobile professionals will appreciate the robust charging power in a portable, grippy chassis.

While the $70 USD retail price sits at the higher end, it’s reasonable for the premium performance, leading brand name and 2 year warranty. I would still like to see a second USB-A charging port in a future revision to enable simultaneously charging multiple devices.

But for shoppers focused purely on speedy, high-capacity charging of single devices across extended use sessions, Duracell delivers the goods. This muscular portable charger now resides permanently in my gadget bag as my new gold standard for powering up on the go.,