how long does your battery hold charge?

plusz · 08-29-2021, 03:13 PM

Hi, I've recently replaced my battery in Max 2, DYI method. Now I'm really curious how good the result is.

I came up with the following quick testing method: With 100% of charge open the built-in web browser to launch some old movie on YT https://www.youtube.com/watch?v=qCoGSRZShy8

I didn't switch it full screen, just left it as it is, only switching to fast e-ink mode so the movie was actually watchable (I didn't really watch the movie, but just kept waiting until it goes silent, checking the batt level from time to time). My battery holds 1h 20 minutes. It's really low compared to a phone, but then I don't have e-ink on the phone. I'm just curious if e-ink draws so much power playing movie(??) or my new battery have rather low capacity.

Thank you in advance for reporting yours, if you're willing to make the test

Renate · 08-29-2021, 04:46 PM

Besides the issue of Hal Holbrook, there's two issues here:

How much current your device takes with a video in a browser.
What the actual capacity of your battery is.

Ok, the two combine for the useful parameter of how long you can play video.

On my Poke3 you can read (if you're rooted):

Code:

# cat /sys/devices/soc/800f000.qcom,spmi/spmi-0/spmi0-00/800f000.qcom,spmi:qcom,pm660@0:qcom,qpnp-smb2/power_supply/battery/charge_counter

(I'm not sure if the separate "shadow" register is one that is reset by the OS.)

You could ask somebody with the same model:

Charge fully up
Measure the battery voltage and the charge_counter
Run a video for x length of time
Measure the battery voltage and the charge_counter

The differences in voltage should be about the same, the differences in the charge_counters should be about the same.

Me, I do so much dev and only read books that I never actually (specifically) charge my devices.

plusz · 08-29-2021, 05:07 PM

I'm mostly interested in comparing with the same model, but other model would also do. On paper my current battery has 4300 mAh. I have about the same battery capacity on my phone where I can watch movies for a few hours, thus either the e-ink draws significantly more power for playing movie or my new battery is subpar. I never watched movie on my Max2, when it was new, so I have nothing to compare.

08-29-2021, 03:13 PM	#1
plusz Addict Posts: 370 Karma: 50008 Join Date: Feb 2017 Device: 13.3" Boox Max2, 7" Kobo H2O	how long does your battery hold charge? Hi, I've recently replaced my battery in Max 2, DYI method. Now I'm really curious how good the result is. I came up with the following quick testing method: With 100% of charge open the built-in web browser to launch some old movie on YT https://www.youtube.com/watch?v=qCoGSRZShy8 I didn't switch it full screen, just left it as it is, only switching to fast e-ink mode so the movie was actually watchable (I didn't really watch the movie, but just kept waiting until it goes silent, checking the batt level from time to time). My battery holds 1h 20 minutes. It's really low compared to a phone, but then I don't have e-ink on the phone. I'm just curious if e-ink draws so much power playing movie(??) or my new battery have rather low capacity. Thank you in advance for reporting yours, if you're willing to make the test

08-29-2021, 04:46 PM	#2
Renate Wizard Posts: 2,318 Karma: 9999999 Join Date: Feb 2012 Device: Nook NST, Glow2, 3, 4, '21, Kobo Aura2, Poke3, Poke5	Besides the issue of Hal Holbrook, there's two issues here: How much current your device takes with a video in a browser. What the actual capacity of your battery is. Ok, the two combine for the useful parameter of how long you can play video. On my Poke3 you can read (if you're rooted): Code: # cat /sys/devices/soc/800f000.qcom,spmi/spmi-0/spmi0-00/800f000.qcom,spmi:qcom,pm660@0:qcom,qpnp-smb2/power_supply/battery/charge_counter (I'm not sure if the separate "shadow" register is one that is reset by the OS.) You could ask somebody with the same model: Charge fully up Measure the battery voltage and the charge_counter Run a video for x length of time Measure the battery voltage and the charge_counter The differences in voltage should be about the same, the differences in the charge_counters should be about the same. Me, I do so much dev and only read books that I never actually (specifically) charge my devices.

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08-29-2021, 05:07 PM	#3
plusz Addict Posts: 370 Karma: 50008 Join Date: Feb 2017 Device: 13.3" Boox Max2, 7" Kobo H2O	I'm mostly interested in comparing with the same model, but other model would also do. On paper my current battery has 4300 mAh. I have about the same battery capacity on my phone where I can watch movies for a few hours, thus either the e-ink draws significantly more power for playing movie or my new battery is subpar. I never watched movie on my Max2, when it was new, so I have nothing to compare.

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