OKZU 10000mAh Fast Charging Portable Power Bank, 22.5W QC 4.0 & PD 3.0 Type C Powerbank, USB C Portable Charger, External Battery Pack for iPhone 13 12 X Pro iPad Samsung Galaxy S21 S20 Mobile Phone

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The adaptor you’re using could be faulty or delivering too low an output for the power bank to charge. Consider trying a different adaptor. If this resolves the issue, it’s a clear sign that your original adaptor is faulty and needs replacing. Furthermore, while the power bank is not being charged, if you press the power button, all the LED lights will be briefly turned on, according to the charge level of the battery. Other Functions the LED Lights Can Have When we test a power bank, we look at the usable energy you get from it and divide it by its capacity. This is what we call energy conversion efficiency. If you’re sure that the main issue is a dead or faulty battery, then here’s the best plan of action to take: Using the Anker Prime power bank, we were also able to test the charging speed claims of other power banks, as the Anker Prime will report charging speed in wattage.

We reserved a dedicated section for a blinking red light because it’s a rather important one. Because there’s no universal power bank language, it can mean different things depending on each model. Here are the most common interpretations of the red light blinking on a portable charger: The 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. Our favorite power bank has a 10,000mAh battery, and the Samsung Galaxy S23 Ultra has a 5,000mAh battery, so the math should be simple, right? It charges twice. Except that's not how it works. Power banks are not 100% efficient, and even though you start with plenty of power, a lot of it is lost in the charging process.

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Compared to the more durable options we tested, the Fast Charge has an all-plastic casing that feels a bit delicate and cheap to the touch. It survived our drop test and continued to function, but it just doesn’t have the feel of excellent build quality. Still, it’s a perfectly usable power bank.

Most of the power banks on this list hold around 10,000 mAh — a standard size for recharging small devices like smartphones, Bluetooth headphones, and smartwatches. Though brands often claim their 10,000 mAh power banks can recharge smartphones five, six, or seven times — they rarely live up to those claims. Overheating: Some power banks have a built-in safety feature that triggers a blinking red light when the device is overheating. This can occur if the power bank has been in use for an extended period if it’s charging a device while being charged itself, or if it’s been left in a hot environment. If you charge a pair of earbuds with a superpowered fast-charging wall port or power bank, it can cause irreversible damage to the battery life of those headphones. Many modern power banks — such as the OKZU C10002Y and the OtterBox Fast Charge — can decrease their output to meet the needs of a small device or fragile battery.

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Safely dispose of the defective device . If nothing else worked and the power bank is unsalvageable, the best thing to do is to safely dispose of it. The only secure way to do that is to take it to a designated collection point for small electronics and/or batteries. This way you can ensure the battery will get recycled and will not end up in a landfill where it would potentially release toxic substances or even start garbage fires. The bottle is actually a nice, insulated affair, and it kept ice in cold water for 12 hours, which is all that we need. It has a good, strong strap to carry the bottle, though we would have liked a lid that was easier for sipping. 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.