• Experiment Methodology: Researchers tested 40 phones over two years, completing 500 charge-discharge cycles using custom automation tools to compare the effects of different charging habits [00:01:11].
• Fast Charging vs. Slow Charging: The study found that fast charging does not significantly harm battery health. After 500 cycles, the fast-charging iPhone group lost only 0.5% more capacity than the slow-charging group, while fast-charging Android phones actually showed slightly less wear than the slow-charging group [00:03:03].
• The 30-80% Charging Habit: Maintaining a battery level between 30% and 80% reduced wear by 2.5% to 4% compared to full 0-100% cycles. While technically better, the researchers suggested the real-world benefit is limited compared to the effort [00:03:27].
• Long-term Stability: Storing phones at 100% charge for a week showed no measurable change in capacity, reinforcing that battery degradation is a gradual, long-term process [00:04:13].
• Battery Replacement Guidelines: Battery life begins to noticeably shorten when health drops to 85%, and the researchers recommend replacement when health reaches 80% to maintain a good user experience [00:05:01].
• Performance & Throttling: Battery wear does not inherently slow down the phone's peak performance, but degraded batteries cause the system to throttle (slow down) earlier at low charge levels (e.g., at 11% instead of 5%) to prevent power failure [00:05:38].
• Conclusion: The technical differences in battery wear from various charging methods are minimal. The best approach is to charge your phone conveniently and avoid trading "mental energy" for negligible battery gains [00:04:20].

for - stats - speed - cultural (technological) evolution - cell phone - 35 years to touchscreen phones - comparison - speed of cultural vs biological evolution - progress trap

https://amzn.to/3Aj23KL

A 42 pocket cell phone "hotel" could be repurposed to hold the typeslugs and typebar assemblies for typewriters being disassembled, cleaned, and then reassembled.

There are smaller 30 and 36 pocket versions, but 42 is just about right for the number of typebars most typewriters have.

Governor Newsom urges schools to immediately restrict cell phones in the classroom ahead of the new school year | Governor of California

https://www.youtube.com/watch?v=3h0Y6qE4TKg

This part of the dialogue creates a good view of how consumerism will be just as prominent as today if not more. when he says we've got a lot of telephones, it might suggest that they are extremely reliant on technology so in a sense the movie had correctly predicted our current addiction and reliance on mobile phones.

yup

Good article on Cricket's Wireless Cell Phone Plans: https://www.nerdwallet.com/blog/utilities/cell-phones/cricket-wireless-cell-phone-plans/

Technology is tying cities together, making them stronger, quicker to adapt to changes, and more able to respond to threats.