We didn't do our usual battery life tests on the 1s but in our usage, the 3,000mAh battery did alright, with over four hours of screen-on time with regular use.
The phone comes with a fast charger, charging the phone from flat to 100% in about 90 minutes.
The 1s has a 13-megapixel camera on the back and an 8-megapixel camera on the front. Camera quality is perhaps the biggest downside to this phone, as neither of the cameras is any good.
The rear camera often blows out highlights and has bland washed out colors. Low light images are terribly noisy with poor detail.
The front camera is not much better. If you're concerned about image quality, it's best to avoid this phone. They had to cut some corners to go down to this price.
The LeEco 1s is priced very well, especially in India, which is one of its key international markets, where it goes for Rs. 10,999 ($165). At this price, it would be hard to be picky with its flaws.
Fortunately, there isn't a whole lot wrong with it. In fact, it does quite well in many areas, such as design and build quality, display, and performance. Where it falters is in camera quality, and the company may have gone a bit overboard with the UI customizations. But apart from that, there is not much to fault, and at this price, the phone is a steal.