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- User-replaceable 2250mAh battery
- Battery needs a daily charge with moderate use
The 2250mAh battery inside the Nuu X4 offers decidedly average stamina, despite the weak nature of the chipset and that 720p screen. A day of typical use left the phone gasping for air, and we had to charge it before bedtime most days.
On the plus side, the battery is user-replaceable, so you can carry around a spare if you need to – that's a feature fewer and fewer Android manufacturers are offering these days, so it's definitely a plus point.
During our standard TechRadar video test, which consists of playing a HD video clip is played for 90 minutes with the volume and screen brightness at maximum, and accounts syncing over Wi-Fi in the background, the X4 lost around 34% of its battery life.
- 13MP rear-facing and 5MP front-facing cameras both poor
- Video quality is no better than stills
The Nuu X4 comes with a 13-megapixel rear-facing camera and a 5-megapixel front-facing one, and neither is truly up the job of taking decent-quality shots. The main camera struggles when it comes to properly exposing an image, and is also frustratingly sluggish in terms of focus and capture time.
The resultant photos are dull, lack vibrancy and – when you zoom in close – are packed with image noise. There's a HDR mode, but this adds a few more seconds to the capture time and doesn't really enrich images all that much, so we quickly stopped using it.
During our review period we didn't take a single snap we were totally happy with – the Nuu X4 is a very poor choice for mobile photography enthusiasts. The front-facing 5-megapixel camera is equally disappointing, but as long as you limit it to selfies and the odd video call, it's less of an issue.
The X4's main camera can capture video at 1080p, but the results are predictably poor, with the same complaints that apply to static images applying – footage lacks colour and life. The front-facing camera is limited to 720p recording.
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