An impressive blend of subtle style and power in one succinct package.

Power makes the world go round these days. We seem to need it for everything from portable fans to our laptop computers. A few years ago, I found that if I carried a portable battery, or power bank, with me, I would always have the security that I wouldn’t run out of power when I needed it most. The problem becomes having a power bank that can keep up with me and my lifestyle. Sometimes the batteries I keep with me are just too small of a capacity to make a difference. At any given time, I have an iPhone 7, 12-inch iPad Pro, and a 2016 MacBook Pro with Touch Bar with me. Each of these devices has very different needs as far as power go. The iPhone will work with a standard power adapter (5V, 1A), the iPad Pro needs a 12W power adapter, and my MacBook Pro requires 61W or greater to sufficiently charge its battery. It’s a power-driven world and you have to have just the right type of power to keep your devices going.

The Longuard 10 10000mAh Power Bank by ROMOSS is an impressive blend of subtle style and power in one succinct package. For starters, the battery is a 10,000mAh capacity battery. That is enough to charge my iPhone 7 more than 5 times or my iPad Pro once. It’s a high capacity battery and that’s what I like to keep on me. The Longuard has dual 2.4A outputs, which will allow for faster charging on most mobile phones and standard charging with most tablets. You can charge two devices simultaneously and ROMOSS’s proprietary Quick Charge technology will protect your devices by detecting and delivering the fastest, safest charge possible.

ROMOSS Longuard 10 10000mAh Power Bank REVIEW

Some of the additional features of the Longuard battery include:

  • Rapid Recharge: The battery can be fully recharged in 4 hours. That is statistically almost 45% faster than other power banks in its class.
  • Multiple Port Access: The power bank will charge using Micro USB or USB-C. There are two USB-A ports available for output charging. The USB-C port can be used for either input or output charging.
  • Self-Diagnosis: Longuard features battery cell monitoring and 9 different safeguards. It protects itself and external devices against overcharging, overheating, short circuits and excessive current conditions.
  • Auto Shut-Off: In the event that Longuard detects an anomaly during charging, it will automatically shut off.

A unique feature of the Longuard battery is its lifespan. The Longuard 10 10000mAh Power Bank’s claim to fame is that it has an incredibly long lifespan. The technology used to make this power bank is the same tech that is used in electric cars. According to their website, the optimized 26650 battery cells last for years, are certified for over 1000 charging cycles and represent a 60% increase in lifespan. While I’ve not been able to test this particular feature, I can say that the Longuard seems very robust and the included 3-year warranty from ROMOSS is encouraging.

ROMOSS Longuard 10 10000mAh Power Bank REVIEW

The battery arrives in a solid black box with ROMOSS embossed on the top. It’s very easy to miss this box since it’s so subtle, but that is also what I like about the style of the battery. The power bank is 3/4 the height of my iPhone 7, but 2.5 times as thick. It weighs approximately 11 ounces (312 grams), which is about 2.25 times as much as an iPhone 7. The Longuard is hefty. It has an aluminum exterior and is solid black with the exception of the ROMOSS logo, which is stamped on the case in a complimentary gray. My Longuard battery arrived with 25% battery life — or approximately 2500mAh for charging out of the box. There are two cards in the box about activating the warranty along with a short user guide, Micro USB charging cable, and a carrying pouch.

I decided to run the Longuard through a series of user tests. The results are below.

iPhone 7: This was the first device I plugged into the Longuard. When I did, the battery status indicator lit up showing how much life the power bank had. It quickly turned off and the iPhone did not start charging. I pressed it again, but the iPhone would not start charging. I switched USB ports and the iPhone started charging right away (indicated by the lightning bolt displayed next to the battery percentage on the iPhone menu bar). I did continue listening to streaming music while the iPhone was charging and using its timer function. Started with 53%. After 10 minutes, 65%. 

Libratone Wireless Headphones: These headphones charge using Micro USB. Unlike the iPhone 7, I didn’t have any issues with the headphones starting to charge immediately. Started at 0% (a percentage wouldn’t register on the iPhone). After 10 minutes, 20%.

NOTE: After 5 minutes of charging these two devices simultaneously, the single LED light on the battery began blinking. This indicated that it would need charging soon. I did continue to let the attached devices charge until 

ROMOSS Longuard 10 10000mAh Power Bank REVIEW

12-inch iPad Pro: Since the iPhone charged with no issues, I didn’t think I would have any problems with the iPad Pro charging. As predicted, the iPad immediately started charging when plugged in. With the iPad Pro requiring a stronger power output from a power source, I wasn’t sure how quickly it would gain a charge. As it turns out, the iPhone gained a little more than 1% per minute, while the iPad only gain 0.4% charge per minute. Started with 37%. After 10 minutes, 41%.

2016 MacBook Pro with TouchBar (13-inch): Even though I was fairly certain that the power bank would not charge my MacBook Pro, I decided to plug it in any way to see what sort of reaction I would get from both devices. When I plugged it in, the MacBook Pro chimed to indicate it had been plugged into a power source. The status in the menu bar showed that the computer was plugged into a power adapter and to my surprise, it showed that the battery was charging. I waited for several minutes to see if the percentage number was gaining a charge and found that after about 5 minutes a 1% gain was registering on my MacBook Pro. I don’t know if this battery is meant to charge the MacBook Pro, but it appears to work well in a pinch.

Charging of the Power Bank: When I charged the power bank, I decided to use a USB-C cable and the 12W Apple Power Adapter that comes with the 12-inch iPad Pro. After one hour of charging, the battery had gained between 25-50% charge. The battery itself did not become warm, but the power adapter and USB plug that was connected to the power adapter were a bit warm.

When the ROMOSS Longuard 10 10000mAh Power Bank came across my desk, I thought it was just another run-of-the-mill portable battery. What I found was a powerful, high-capacity battery that can handle anything you throw at it. It’s a very affordable portable power solution that I plan on using as my go-to power bank for the foreseeable future.

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