On February 11, Jiayu S3 was received from the seller by Singapore Post, and on February 23 it came to my local post office, where I received it on February 25. The box contained a standard set – the phone with the battery, documentation in Chinese, white charging and data transfer cable and white original Jiayu charger 5V and 1A with China (US) plug, as well as an adapter for European sockets. The phone is black, and the accessories are white, a little surprise from Jiayu. You can get somewhat different set. As I have pointed out above, there is English box for this device, and the phone itself, will probably have a different firmware, without Chinese communication frequencies and Chinese programs. In addition, you may receive the charger with different plug, which is suits your sockets.
The screen protector is glued to the screen perfectly, so that it all can be seen only near the front speaker and sensors, without a single speck of dust or air bubbles. This indicates a significantly increased culture of assembly of Jiayu phones and increased degree of automation of the process, which is good.
No issues with build quality, everything is fine here. No squeaks, the gaps are small and smooth; the materials are pleasant to the touch and appearance. The buttons seem to be madefrom metal. The phone is compact enough for 5.5″ screen; it is smaller in all dimensions than Xiaomi Redmi Note with the same screen size. It weighs 159.9 g with battery, Redmi Note is heavier – 199.5 g, the capacity of the batteries in phones is almost equal, Xiaomi is slightly ahead – at least 3100 mAh with typical 3200 mAh, and this is the better way to show the battery capacity, against 3000-3100 mAh for Jiayu.
The device is equipped with a battery, which has a typical for modern 5.5” phone capacity, 3000 mAh. The manufacturer indicates its capacity as “3000-3100 mAh.” In S3, I suppose, we have a typical capacity of 3000 mAh and 3100 mAh maximum capacity. Nevertheless, the results of the battery life test in Jiayu S3 are very close to the results of Xiaomi Redmi Note, despite the fact that Xiaomi has a bit bigger battery, lower screen resolution (720×1280 VS 1080×1920), and less powerful processor MTK6592 1.67 GHz against MTK6752 1.69 GHz for our today’s hero.ThL 5000 in the battery life test shows somewhat better results than Jiayu S3, but it has a non-removable battery with a huge for cell phone capacity of 5000 mAh and a smaller screen (5 inches, but the same resolution as that of the Jiayu S3). Processor in ThL 5000 – MT6592T. It is an overclocked to 2,0 GHz version of the standard MT6592. Despite a higher maximum operating frequency of MT6592T, MT6752 performs much better, which is confirmed by the test results. With Jiayu S3, you can count on 4-5 hours of heavy games, 6-7 hours of simple games, 8-10 hours of video and about the same 8-10 hours for the Internet via WiFi. The book may be read up to 15 hours.Maximum charge current – up to 1A according to a fairly accurate Charger Doctor with a good cable, but can be lower on the warm device (if you actively use it during charging) to protect the battery. Redmi Note and ThL 5000 charged a little faster – up to 1.25 A and 1.3 A, respectively, so here Jiayu lagging behind. Full battery charge can take up to 3.5 hours. Note, that the result will vary depending on the brightness of the large and high-resolution screen. To improve the results you should lower the brightness to the lowest comfortable level. In addition, we can expect the further improvement of the results of battery life with the release of firmware updates, including the previously promised Android 5.0. In general, we can state the fact that Mediatek MTK6752 turned to be a very energy-efficient processor, despite the fact that its performance is increased significantly compared with MTK6592.
Jiayu S3 Smartphone has a very nice and responsive capacitive touch screen supporting 10 simultaneous touches. Accuracy and speed of touches definitions is at the highest level. However, the sensor does not like low-quality chargers. Unlike some other manufacturers, Jiayu does not add filters that allow you to avoid false touches or their losses, when charging your phone with low-cost universal USB charger. There are no problems when charging with the original charger, computer USB port and charger from Xiaomi Redmi Note, but when charging with no-name, but normal quality charger, tested with dozens of different devices, touch sensor starts to react a bit inadequately. Nothing like what we have seen on some devices 2 or 3 years ago, but still. So be warned.