Timing is everything. While preparing for an upcoming overseas trip, I opened a drawer and noticed that my trusty 10,000 mAh battery pack—one I’ve owned for too many years to count—had swollen and split down the middle! A quick web search confirmed I had a genuine, potentially imminent fire hazard on my hands. Suggestions ranged from placing it in a metal container and burying it under sand or cat litter (neither of which I had at home) to taking it immediately to a hazardous waste depot (all of which were closed for the weekend). Just ten minutes prior, this potential hazard had been sitting quietly in my drawer.
The local fire department agreed it warranted immediate attention and asked me to bring it to the nearest station at once. The firefighters who received it seemed more sanguine, but they gladly took it off my hands.
Crisis averted, I still needed to replace my trusty battery.
Right on cue, UGREEN contacted me to offer their latest magnetic power bank for review: The UGREEN MagFlow Pro Magnetic Power Bank 10,000mAh 25W features 3-in-1 charging and claims to be industry-first liquid-cooling system with a visible liquid cooling system, multi-layer heat dissipation, a built-in 45W USB-C cable, and a smart display. Cool! Literally!
Giving It a Once-Over
There was a time when my phone was the only thing needing a midday recharge (along with my brain around 3:00 PM, which always needs a hit of caffeine). Today, my travel kit is packed with power-hungry gadgets: AirPods, a smartwatch, cameras, and microphones. Juggling them and hunting for outlets is a chore, making a portable pack that can safely charge multiple devices a lifesaver.
The UGREEN MagFlow Pro Magnetic Power Bank 10,000mAh 25W can power up to three devices simultaneously. Snap it magnetically to the back of your phone, charge your earbuds with the built-in braided USB-C cable (which doubles as a carry strap), and plug a third gadget into the spare USB-C port, all at the same time. It also supports pass-through charging, meaning you can recharge the bank from a power source while it continues replenishing your connected gear. (Note: The unit does not plug directly into a wall outlet; you will need an external USB-C power source or laptop port to charge it).
Like all multiport battery packs, the maximum 45W total output is shared among connected devices. Wired output from either the integrated cable or USB-C port tops out at 45W, while the magnetic pad supports the new Qi2 25W wireless fast-charging standard. Recharging the power bank itself accepts up to 30W, which tops the 10,000 mAh capacity back up to 100% in roughly two hours.
Real-world yield depends on your device and connection method. Wired charging via the 45W USB-C cable delivers roughly 15–25% more usable energy than wireless charging, as physical connections bypass the inductive heat and transfer losses inherent to wireless coils. For larger handsets, expect roughly 1.3 to 1.5 charges over a cable, or about one full wireless charge with a little left over. Standard-sized phones will easily see up to two full charges over a wire. Charging speeds also scale by phone generation: while modern flagships can pull up to 20W–25W wirelessly, older hardware steps down to 15W Qi2 charging.
Pump It Up
Heat is the primary enemy of lithium-ion batteries and charging performance. High operating temperatures degrade cell capacity and trigger thermal throttling. Worse, prolonged heat can drive chemical decomposition that releases volatile gases inside pouch cells, causing internal layers to separate and the casing to bloat—the exact issue that destroyed my old battery. Left unchecked, extreme heat can even lead to thermal runaway.
To solve this, UGREEN built in an active CryoPulse micropump liquid-cooling system paired with a vapor chamber copper foil. According to UGREEN, this multi-layer system reduces peak temperatures by up to 18°F and limits temperature rise by up to 44%, which helps prevent charging speeds from throttling deep into a charge cycle. On the safety front, the pack uses high-density ATL "Dymondcell" battery cells rated for 800 cycles and tested against punctures, crushing, and high-heat environments.
A few practical observations on the cooling loop:
- The Window: From the product photos it looks like the window through which you can view the coolant circulating is illuminated. In reality it is not and the smoked window on the back plate is quite dark.
- No Built-In LED: While the packaging graphics might make the cooling chamber appear lit up, there is no integrated light behind the window.
- Acoustics: If you hold your phone to your ear while it is actively fast-charging, you might hear a subtle buzzing from the liquid pump. A two-second press on the power button temporarily deactivates the pump to silence it.
Sizing It Up
Measuring 4.27 x 2.78 x 0.64 inches and weighing about 8.1 ounces, this pack is neither tiny nor featherweight. That is the physical reality of integrating a 10,000 mAh dual-cell battery, Qi2 magnetic array, braided cable, and an active liquid loop into a portable shell. It can feel bulky if you hold it up to your ear during extended phone calls, though using speakerphone or wireless earbuds makes the weight a non-issue.
Keeping an Eye on Things
A small digital display on the side of the unit provides real-time stats, including remaining battery percentage, current output wattage, and charging cycles. The screen is compact—barely larger than a microSD card—so you might need your reading glasses to read the finer details, but it is crisp and bright.
Part of a Bigger Ecosystem
The MagFlow Pro is the portable flagship in UGREEN's latest charging ecosystem.
The desktop MagFlow Pro 3-in-1 Charging Stand (25W) features TEC cooling paired with a whisper-quiet fan to charge a phone, Apple Watch, and AirPods at once. They claim it can fast-charge an Apple Watch Series 11 to 50% in just 19 minutes, so you can charge it while you brush your teeth and take a shower in the morning!
For minimalist travel, the MagFlow 2-in-1 Foldable Charger (25W) flips open into a dual wireless dock or folds flat into a compact puck. Across the line, UGREEN pairs these active thermal designs with their Thermal Guard temperature monitoring to maintain safe, steady output.
The Verdict
The named UGREEN MagFlow Pro Magnetic Power Bank 10,000mAh 25W turns what could have been another mundane accessory into a thoughtfully engineered, desirable piece of gear. Having fast, cool-running Qi2 wireless power and an integrated 45W cable in your day pack makes keeping multiple devices topped up completely painless. Highly recommended.
