oukitel-k10000

In this day and age, if an Android smartphone can get you to the end of a second day on a single charge with mixed use, we'll rave about how incredible the battery is. Normally, that means having a battery with at least 3,000mAh of juice. Now, there's a Chinese manufacturer with a phone that it says will last up to 15 days because it has an enormous 10,000mAh battery.

While we doubt the 15-day usage claim, given our experience with many Android devices, the Oukitel K10000's battery should be able to manage at least 5 days quite comfortably. I haven't had a phone last that long since my BlackBerry Bold in 2010, and even then, that was with 3G switched off. Whatever the actual usage statistics, it'll blow almost every other flagship out of the water, including ASUS' 5,000mAh ZenFone Max.

Of course, with great power comes great thickness. Although even in that regard, it's not terribly bulky. It measures in at 9mm thick, 77mm wide, 143mm tall and weighs 184grams.

Size isn't the only downside of having such a high-capacity battery. It also takes considerable time to fully charge. Even with its Quick-Charge support, the huge battery takes 3.5 hours to go from 0-100. Still, it's worth remembering that even if you only charge it to 20%, that's still almost a day's worth of power. It can also reverse-charge other products, and claims to be able to charge up three iPhone 6s Plus units and still have 10% power left.

Other specs aren't quite as mind-blowing, but decent nonetheless. It has a 5.5-inch 720p display, 64-bit quad-core processor, 2GB RAM and 16GB storage (expandable to 32GB). There's also a 13MP camera on the back with HDR, panorama and an anti-shake feature as well as a 5MP camera on the front. It also has a bunch of the usual software tweaks added to the Android 5.1 Lollipop OS interface, like the ability to launch apps by 'writing' a letter on the lock screen, or a three-finger swipe down for taking screenshots.

If you want to snag one, you can pre-order from GearBest for $239. It's worth noting that its network support is a little limited. Its product page lists support for 800/1800/2100/2600 MHz 4G LTE bands and 1900/2100MHz WCDMA 3G bands. Before you order expecting super-fast cellular speeds, be sure to check with your carrier which network bands need support.