Anecdotally, when we bought my girlfriend her first Kindle about five years ago, we noticed it was requiring charging way more often than the back-of-the-box battery life quote of "weeks of battery life". Upon calling an Amazon agent, they referred us to the fine print for that quotation:
> A single charge lasts up to six (6) weeks, based on a half hour of reading per day with wireless off and the light setting at 13. [0]
We were still pretty pissed at the blatant false advertising (a hardcore book reader reads for only a half hour a day!?!), but moving forward, she keeps the device in airplane mode 95% of the time, only turning it off to download whatever new book she just bought. It increased to at least 2-3 weeks after that, instead of a single week.
The nice thing about the kindle is that with both wifi and light off, the battery use is nearly non-existent between pages. So the difference between 30 mins / day and 6 hours / day of reading is not that large, tbh.
> A single charge lasts up to six (6) weeks, based on a half hour of reading per day with wireless off and the light setting at 13. [0]
We were still pretty pissed at the blatant false advertising (a hardcore book reader reads for only a half hour a day!?!), but moving forward, she keeps the device in airplane mode 95% of the time, only turning it off to download whatever new book she just bought. It increased to at least 2-3 weeks after that, instead of a single week.
[0] https://www.amazon.com/Kindle-Paperwhite-Waterproof-Storage-...