We found that the C10002Y gets warm to the touch when plugged into the wall, but this is likely just a result of the thin plastic casing — not a major concern. Speaking of the casing, this definitely isn’t the most rugged power bank on our list. It feels like one significant chest-height drop onto a hard surface would be the end of it. We held our breath during the 2-foot drop test, and though it did survive, it sustained minor visible damage.

Four indicator lights convert battery levels — including one light that turns green when “fast mode” is engaged. Interestingly, this light turned green while charging an iPhone via the USB-C port, but not when charging earbuds via a USB-A port. It seems there is some kind of sensor in the OKZUthat engaged fast charging mode when the receiving device has a compatible battery. Neat. Apple doesn't publish its battery capacity, but teardowns have shown that the iPhone 15 has a battery with around 3,350mAh of battery life. That means a 10KmAh battery can charge that phone twice ... almost. You may not get to 100% the second charge, but you'll be in the 90% range.

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This also holds true for USB hubs that don’t have fast charging protocols. A lot of time people are not aware that different power sources have different power outputs, so they expect the same results regardless of what they’re using. But simply charging a power bank via a low-powered laptop’s USB port can add up to 10 hours to the total charging time, especially if it’s a high-capacity power bank. 5. Experiment With a Different Wall Charger

You need a lot of power: Thankfully, the battery on the Tylt Bottle 2 isn't so big it adds too much weight, but that also means it isn't powerful enough for multiple charges. Smartphone batteries are becoming larger and more efficient. In our experience, 10,000 mAh power banks will charge a modern smartphone between two and three times. On this list, the Nitecore NB10000 is the most impressive 10k mAh power bank that we tested. It fully charged an iPhone 13 two and a half times.Sometimes even the slightest pinch can damage charging cables. I accidentally squished numerous charging cables with the foot of my stool as I was working at my desk. These things happen almost on a daily basis, but we seldom think that they might have an impact on the cables themselves. 4. Don’t Charge Your Power Bank Via a Laptop’s USB Port As the power bank charges usually one LED light blinks, the last one in the series. For example, if there are 3 LEDs on, then only the 3rd one will blink until the next charging level is reached and then the 4th LED will start blinking. Once the power bank has reached a 100% charge level, all the LED lights will be constantly on, without any one of them blinking, until you unplug the device from the charger. And as you start charging another device using your power bank, the LED blinking pattern will resume designating the transfer of electricity. Error Indication: Some power banks use LED lights to indicate problems. For instance, if all lights are flashing simultaneously, it might be a sign that there’s an error, like a short circuit or an overcharging problem. In some cases, you might notice that the power bank is not charging despite being plugged into a power source, with the LED indicator lights flashing.

Unlike most power banks on this list, the Flip 24 only has USB-A input and output. It’s not surprising for such a small bank, but it might be annoying for folks without a compatible cable. Plus, USB-C charging tends to be faster than USB-A. The Flip 24 will charge your phone slower than most other options on this list. Additionally, keep an eye out for debris (like dust, sand, lint, or dirt) that might be lodged in the charging port. This could disrupt the connection, so ensure the port is clean, but do so gently to avoid damaging any components. 3. Use a Different Charging Cable The battery charge level of the power bank is just one function of the LED lights, albeit the most common one. But the LED lights can also communicate other things as well. Here’s a list of some of the most common issues that they might signal: Again, each power bank is different, so for the exact interpretation of a red LED blinking on your power bank, please consult the user manual. You can also get in touch with me via the comment section below and I’ll do my best to figure it out. LED Lights Blinking But the Power Bank Won’t ChargeThe Anker Nano is only 5,000mAh, but that doesn't mean it can fully charge a 5,000mAh phone battery like you'll find in the Galaxy S23 Ultra. Power banks are about 60-70% efficient, depending on the phone's technology, so this power bank is good for charging an iPhone 15 to nearly full, but that big Ultra will only get about 65% charge. The most common kind of input port is USB-C — the same port found on all modern iPhones. USB-C ports are easy to use, efficient, and durable. That means I could twist my phone sideways into landscape mode and use the Baseus power bank as a portable stand for Apple's new StandBy mode, which is one of my favorite features on iOS 17, and certainly the one I use the most often. In terms of charging, this massive power bank can charge an iPhone 15 more than five times. It can charge a big Galaxy S23 Ultra's 5,000mAh battery three-and-a-half times. Best of all, it charges at the fastest speed available on most of your favorite phones (excluding Oppo/OnePlus's unusual SUPERVOOC battery). You can also charge the Anker Prime using both USB-C ports at the same time, for a combined recharging rate up to 170W. That means you can completely refill this whopping 27K mAh battery in under 40 minutes. I thankfully had an Anker 737 GaN Prime charger that was up to the task, and it's fun to see the percentage climb.