Some phones do have high-quality speakers for playing music, but these are not placed right next to the earpiece - this would be a surefire way to deafen your users. Subwoofer - A subwoofer is a large bass speaker, which this is not.Many devices have a small second battery which is only used for keeping the clock time.XKCD Phone 3 was powered by two AA batteries (not included), which have an energy capacity roughly 100 times larger.Worse, this battery is non-rechargeable, meaning that it would have to be replaced to use the phone again after it is exhausted (every 11 minutes, at that!). The nickel–iron battery may contain lithium hydroxide, but it's terrible for most applications. There is nothing normally called a "nickel-lithium-iron battery" - rather, this seems to be a malamanteau of the experimental nickel–lithium battery and the common lithium ion battery (which does not contain any iron) or the lithium-iron-phosphate battery, often called lithium-iron, but more often called the LiFePO battery. This phone's battery is dreadful (under a typical current draw of 0.1A, it would power the phone for about 11 minutes). In comparison, an iPhone 6+ has a battery capacity of 2,750 mAh. Quoted in more standard terms, this phone's battery capacity is 18 mAh. Usually, the capacity is quoted in milliampere-hours (one-thousandth, or 10 -3, of an ampere hour) however, this one is quoted in microampere-hours (one-millionth, or 10 -6, of an ampere-hour), presumably as a marketing ploy to give a more impressive-looking number.
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