PW4 battery drain test

[ilovejedd]

I mentioned a couple of weeks ago I'd do a battery drain comparison on the PW4.

Originally Posted by ilovejedd

I do have a lone registered PW4 but I forgot it in the office. I'll do a 4-way test when I get it back in my hands.

Anyway, results are in. Threw in a PW3 and KT4 into the mix.

Initial charge was noted on 7/23/2019 around 10-11am. Final charge was noted on 8/19/2019 around 10-11am.

• PW4 5.10.0.2 factory: unregistered, shutdown: 100% - 97% = 3%
• PW4 5.10.0.2 factory: unregistered, airplane mode on: 100% - 95% = 5%
• PW4 5.10.1.3: unregistered, airplane mode on: 100% - 95% = 5%
• PW4 5.10.1.3: unregistered, airplane mode off: 98% - 92% = 6%
• PW4 5.10.1.3: registered, airplane mode off, deep sleep: 99% - 91% = 8%
• KT4 5.11.0: unregistered, airplane mode off: 98% - 89% = 9%
• PW3 5.8.11: unregistered, airplane mode on: 99% - 73% = 26%

The PW4 on deep sleep is without Special Offers.

I think I might have bungled up on the PW3 test, though. It was on screensaver but I apparently left KUAL running (to check battery status) so I don't know if that prevented the device from going to sleep. Then again, the PW3 was a refurb purchased from Woot and based on serial number, has a manufacture date of 9/12/2016 so it's quite possible battery on that is degraded.

[hius07]

What are the conclusions? I see
- shutting down significantly decreases battery drain
- wifi does not affect the drain (in sleep)

[patrickt]

I'm on 5.12.1

[j.p.s]

Originally Posted by ilovejedd

I mentioned a couple of weeks ago I'd do a battery drain comparison on the PW4.

Anyway, results are in...

Initial charge was noted on 7/23/2019 around 10-11am. Final charge was noted on 8/19/2019 around 10-11am.

• ...
• PW4 5.10.1.3: registered, airplane mode off, deep sleep: 99% - 91% = 8%
• ...

The PW4 on deep sleep is without Special Offers.

Thanks for this extensive test.

Would you consider doing a repeat of the PW4 deep sleep test with airplane mode on?

[hius07]

Is there a difference between usual sleep (10 min timeout or button short press) and Screen Off mode (via menu - 7 sec button press)?

[ilovejedd]

Originally Posted by j.p.s

Would you consider doing a repeat of the PW4 deep sleep test with airplane mode on?

Sure. Currently testing deep sleep off, airplane mode off, though so it'll take a while before I can get to that one.

Originally Posted by hius07

Is there a difference between usual sleep (10 min timeout or button short press) and Screen Off mode (via menu - 7 sec button press)?

Didn't test. All were either timeout or button short press. Not something that's quick to check. The above test was ~27 days. Doubt there'll be any difference though.

[93terp]

Originally Posted by ilovejedd

Anyway, results are in. Threw in a PW3 and KT4 into the mix.

Initial charge was noted on 7/23/2019 around 10-11am. Final charge was noted on 8/19/2019 around 10-11am.

• PW4 5.10.0.2 factory: unregistered, shutdown: 100% - 97% = 3%
  
• PW4 5.10.1.3: registered, airplane mode off, deep sleep: 99% - 91% = 8%
  

What exactly is the difference between shutdown and deep sleep, and how does one go about putting the Kindle into those modes?

[j.p.s]

Originally Posted by 93terp

What exactly is the difference between shutdown and deep sleep, and how does one go about putting the Kindle into those modes?

Shutdown is like power off on a tablet. Only jailbroken kindles can be shutdown. One way is the shell command

shutdown -h now

Deep sleep is not yet understood by the user community. It might be something like hibernate.

[93terp]

Originally Posted by j.p.s

Shutdown is like power off on a tablet. Only jailbroken kindles can be shutdown. One way is the shell command

shutdown -h now

Deep sleep is not yet understood by the user community. It might be something like hibernate.

Thanks; didn't realize the shutdown mode was tied to jailbreaking.

[Paperbackstash]

My battery drains a considerable amount with Wi-Fi on and in "sleep" mode. Interesting difference.

[atonement]

Idle drain in case of the PW4 is extremely good. I have not registered my PW3 and it's always in airplane mode but it drains 1-1.4%/d. Before coming across this thread I thought it was pretty good. I keep KOReader running so that I can get to the detailed battery stats as if it's closed it doesn't show any info about the previous time. Maybe that can cause increased idle drain? Will need to check after exiting KOReader.
Edit: 5% drain in case of PW4 in almost 4 weeks! PW3 can't get even close I guess? Mine drains as much in less than a week.