to the process of unlocking the phone in comparison to the fingerprint reader, and that it does not integrate into Android's integrated authentication platforms (making it proprietary to Samsung components). Warnings regarding looking at the sensor for too long were also considered "just a little scary". TouchWiz on the Note 7 was panned for consisting mainly of "'different for the sake of being different' changes that don't add much to the software experience" and make the interface less consistent with third-party software by removing elements of the Material design language. In conclusion, Ars Technica doubted whether the Galaxy Note series was still necessary due to its increasing similarities to the main Galaxy S line, and felt that the device was priced too high, citing Chinese vendors capable of undercutting the prices of major brands while still producing phones of similar specifications. Android Police Upon release, technology journalist David Ruddock of Android Police criticized the Samsung Galaxy Note series for no longer being targeted towards power users like it was years prior. Ruddock stated that since 2015's Samsung Galaxy Note 5, not much except for the S Pen stylus sets the Galaxy Note devices of the year apart from the respective Galaxy S series devices released earlier that year. Battery faults and recalls Battery defects caused many Note 7 units to overheat and combust or explode. On 10 October 2016, Samsung permanently discontinued the Galaxy Note 7 due to these repeated incidents. In the original run of devices, the battery produced by Samsung SDI contained a design flaw that made electrodes on the top-right of the battery susceptible to bending. This weakened separation between positive and negative tabs of the battery, resulting in thermal runaway and short circuits. Following an official recall on 12 September 2016, the Galaxy Note 7 was re-versioned using batteries from China-based Contemporary Amperex Technology (CATL or ATL), which also supplies batteries to the iPhone smartphones. On 23 January 2017, Samsung stated that these batteries had suffered from a manufacturing defect in the welding process, which pushed electrodes up and caused damage to the separation between the positive and negative tabs. Some batteries were also missing insulation tape entirely. Samsung reported that these oversights resulted from the vendor's push to ramp up production of batteries for the replacement phones in order to meet demand. Due to the battery defects, the device was considered a hazmat product, and