Editing 2680: Battery Life
Warning: You are not logged in. Your IP address will be publicly visible if you make any edits. If you log in or create an account, your edits will be attributed to your username, along with other benefits.
The edit can be undone.
Please check the comparison below to verify that this is what you want to do, and then save the changes below to finish undoing the edit.
Latest revision | Your text | ||
Line 10: | Line 10: | ||
==Explanation== | ==Explanation== | ||
− | + | {{incomplete|Created by a BOT WITH ONE MONTH OF BATTERY LIFE LEFT. Do NOT delete this tag too soon.}} | |
− | 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. | + | Smartphones run on batteries that require frequent charging; they may also be frequently replaced with a newer model by their user, though battery life is only one of several reasons why they may do this. 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 corresponds 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}} (For the mathematically and linguistically challenged, 20 months is less than 2 years, and [https://www.merriam-webster.com/words-at-play/couple-few-several-use a 'few' is more than a couple]) 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 2 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. |
This comic appeared on [https://techxplore.com/news/2022-10-eu-lawmakers-impose-charger-smartphones.html the same day that the European Union standardized charging adapters for mobile phones.] | This comic appeared on [https://techxplore.com/news/2022-10-eu-lawmakers-impose-charger-smartphones.html the same day that the European Union standardized charging adapters for mobile phones.] |