Explain xkcd: It's 'cause you're dumb.
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| − | {{comic
| + | ballss |
| − | | number = 2680
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| − | | date = October 3, 2022
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| − | | title = Battery Life
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| − | | image = battery_life_2x.png
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| − | | imagesize = 264x251px
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| − | | noexpand = true
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| − | | titletext = It's okay, I'm at 10%, so I'm good for another month or two.
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| − | ==Explanation==
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| − | {{incomplete|Created by a BOT WITH ONE MONTH OF BATTERY LIFE LEFT. Do NOT delete this tag too soon.}}
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| − | Smartphones run on batteries that require frequent charging; they may also be frequently replaced with a newer model by their user, though for various reasons other than the battery life. In this comic, instead of charging his phone every day for a few years and then buying a new phone, [[Cueball]] has obtained a phone with a battery big enough to last supposedly until the phone will be replaced after a few years. This appears to make for a phone of cumbersome weight and size. According to the caption, 10% of battery life correspondents to 1–2 months; this suggests a total battery life and hence product life of 10–20 months, which is not a few years.{{Citation needed}} However, [https://www.forbes.com/sites/christopherhelman/2013/09/07/how-much-energy-does-your-iphone-and-other-devices-use-and-what-to-do-about-it/?sh=6f8e6fed2f70 a smartphone requires around 1 kWh per year], so this 12 kWh battery could have been expected to last longer. A 12 kWh battery weighing 100 pounds (45 kg) has an energy density of 264.6 Wh/kg, about equal to the high-estimate of the energy density of {{w|Lithium-ion battery|lithium-ion batteries}} of 100–265 Wh/kg. However, it is well below the practically achievable energy densities of (non-rechargeable, as befits the application) {{w|Zinc-air battery|zinc-air batteries}} at around 400 Wh/kg. Unfortunately, {{w|Self-discharge}} means that if this battery is lithium polymer, it will lose on average 5% of its charge per month, which totals to 46% lost each year. If this were a non rechargeable battery such a lithium metal, its battery life could be much longer.
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| − | This may be a commentary on very large external portable charging devices. At present (October, 2022) the largest cell-phone sized charging devices [https://www.amazon.com/dp/B09H4GLZXT/ hold almost 40000mAh and can weigh almost a pound]. Even [https://www.amazon.com/Jackery-Explorer-Portable-capacity-Emergency/dp/B0B8ZLZ53M larger devices are available weighing over 40 lbs] in different form factors. We buy cell phones because of their small size and convenience, and end up buying extra external battery power for them that adds significant extra weight and bulk.
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| − | [[Category:Comics featuring Cueball]]
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| − | [[Category:Phones]]
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| − | ==Transcript==
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| − | {{incomplete transcript|Do NOT delete this tag too soon.}}
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| − | :[Cueball carries a gigantic battery with a phone in it in three different positions in frame.]
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| − | :[Text on battery in first image:] 12 kWh
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| − | :[Caption:] Plugging in my phone is a pain, so I got one with a 100lb battery, and when it runs out of charge every few years I just upgrade.
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| − | {{comic discussion}}
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Revision as of 21:53, 4 October 2022
