Tham khảo tài liệu 'handbook phần cứng pu part 118', công nghệ thông tin, phần cứng phục vụ nhu cầu học tập, nghiên cứu và làm việc hiệu quả | individuals the options of getting 50 store credit or a free battery A number of people later complained that its competitor Sony had misled consumers in its advertising for Sony s music player. Apple s VP of Hardware Product Marketing Greg Joswiak and ZDNet s Brian Cooley were among the people who complained that Sony had not considered real-world usage. 14 15 . edit Non-replaceable batteries The battery in all iPods is not designed to be removed or replaced by the user. Some consumers have resorted to prying the case open in order to tamper with or replace the battery replacement batteries can be found at some online stores which are completely unaffiliated with Apple . Compounding this problem Apple initially would not replace worn-out batteries. The official policy was that the customer should buy a refurbished replacement iPod at a cost almost equivalent to a brand new one. All lithium-ion batteries eventually lose capacity during their lifetime guidelines are available for prolonging lifespan and this situation led to a small market for the aforementioned third-party battery replacement kits. Apple announced a battery replacement program on 14 November 2003 a week before 16 a high publicity stunt and website by the Neistat Brothers. 17 The initial cost was US 99 18 but it was lowered to US 59 in 2005. One week later Apple offered an extended iPod warranty for US 59. 19 Third-party companies offer cheaper battery replacement kits which often use higher capacity batteries. For the most recent iPods soldering tools are needed because the battery is either soldered onto the main board as with the 1st generation iPod nano or attached to a metal backplate as on the 5th generation iPod. 20 edit Bass response The 3rd generation iPod had a weak bass response as shown in audio tests. 21 22 The combination of the undersized DC blocking capacitors and the typical low impedance of most consumer headphones form a high-pass filter which attenuates the .
