Mobileread
Oasis 3 battery
#1  rapidblue 10-26-2020, 07:48 AM
I just recently purchased myself a shiny new Oasis 3 (thank you Amazon Prime day) and I also purchased new Paperwhites for my wife and son.

I've been using the Oasis 3 for just over a week now and the battery is really really bad! I tend to charge my Oasis every 2nd day with about 3 hours of reading a day (light on a mid setting for 50% of the reading time). WiFi is off. I also only have 3 books loaded.

I did a full reset of the device and the battery is still the same

The battery even seems to drain about 5-10% overnight... Doesn't make sense.

My wife and son haven't even charged their Paperwhites once yet over the past week.

Is the battery on the Oasis supposed to be this bad?
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#2  Sirtel 10-26-2020, 09:47 AM
No, certainly not. A book might be stuck indexing, that would drain the battery. Do a search for a nonexisting string of letters, like 'hkkkn'. If the result in 'text in books' is 0, all books are indexed.
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#3  rapidblue 10-26-2020, 10:41 AM
Quote Sirtel
No, certainly not. A book might be stuck indexing, that would drain the battery. Do a search for a nonexisting string of letters, like 'hkkkn'. If the result in 'text in books' is 0, all books are indexed.
Thanks, I did a search for some garbage text and 'text in books' showed 0. I then also searched for a word that would be present in all books on my Kindle and all 3 books appeared in the search (only have 3 books downloaded for now). I assume my indexing is complete then.

I read somewhere about deleting the indexing folder so I just did that so that my Kindle can reindex again - now I'll have to wait an hour or two to see what happens to the battery...
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#4  NullNix 10-26-2020, 11:58 AM
Quote rapidblue
Thanks, I did a search for some garbage text and 'text in books' showed 0. I then also searched for a word that would be present in all books on my Kindle and all 3 books appeared in the search (only have 3 books downloaded for now). I assume my indexing is complete then.

I read somewhere about deleting the indexing folder so I just did that so that my Kindle can reindex again - now I'll have to wait an hour or two to see what happens to the battery...
Just plug it in while it's indexing more than a book or two: it completes much faster and doesn't drain the battery at all
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#5  rapidblue 10-26-2020, 12:07 PM
Quote NullNix
Just plug it in while it's indexing more than a book or two: it completes much faster and doesn't drain the battery at all
When I first downloaded the 3 books I plugged my Kindle in and let it charge overnight. I have charged it 3 times since then and the battery still doesn't last...
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#6  Sirtel 10-26-2020, 12:30 PM
Quote rapidblue
When I first downloaded the 3 books I plugged my Kindle in and let it charge overnight. I have charged it 3 times since then and the battery still doesn't last...
Are you a fast reader? If you read very fast and turn the pages constantly during those 3 hours you read every day, then I guess it's possible to drain the battery in 6 hours. I don't usually read fast unless I really have to, so my Oasis battery lasts much longer than 2 days.
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#7  rapidblue 10-26-2020, 12:45 PM
Quote Sirtel
Are you a fast reader? If you read very fast and turn the pages constantly during those 3 hours you read every day, then I guess it's possible to drain the battery in 6 hours. I don't usually read fast unless I really have to, so my Oasis battery lasts much longer than 2 days.
I wish I was a fast reader. I'm actually quite "thorough" and thus not a fast reader

It's been about 2 or 3 hours since I deleted the indexing folder on my Kindle (so that it would recreate it by itself) - my Kindle has been on standby since then and my battery has not dropped at all!! Maybe it is fixed
If it truly is fixed, I wonder why a factory reset never fixed it.

Oh well, holding thumbs. Will keep an eye on it now and see what happens
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#8  j.p.s 10-26-2020, 12:46 PM
Quote rapidblue
I tend to charge my Oasis every 2nd day with about 3 hours of reading a day (light on a mid setting for 50% of the reading time). WiFi is off. I also only have 3 books loaded.
Do you do your 3 hours of reading in one sitting or spread over the day?

When an Oasis 2 or 3 has been sleeping for about 30 minutes, it writes its RAM to flash memory and powers off. That is to save battery. When it is switched back on it has to read data back into RAM. All this writing and reading RAM uses power, so if it happens several times per day it can use more battery than if the kindle had just been left asleep. The Oasis 3 has a "power save" setting that can be turned off which will stop the hibernating.

Amazon uses 30 minutes reading per day when making battery estimates, so you are doing almost a week of amazon reading each day. Does your family also read their paperwhites around 3 hours a day?
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#9  rapidblue 10-26-2020, 12:56 PM
Quote j.p.s
Do you do your 3 hours of reading in one sitting or spread over the day?

When an Oasis 2 or 3 has been sleeping for about 30 minutes, it writes its RAM to flash memory and powers off. That is to save battery. When it is switched back on it has to read data back into RAM. All this writing and reading RAM uses power, so if it happens several times per day it can use more battery than if the kindle had just been left asleep. The Oasis 3 has a "power save" setting that can be turned off which will stop the hibernating.

Amazon uses 30 minutes reading per day when making battery estimates, so you are doing almost a week of amazon reading each day. Does your family also read their paperwhites around 3 hours a day?
Thanks so much for the info. I am reading in about 2 sittings - usually one in the day (without using backlight) and one at night (using backlight).
Using Amazon's calculations of 30min / day, mid backlight and wifi off, my battery should last around a week - I'm only getting 2 days worth though

Nonetheless, as mentioned in my previous post, I "might" have found the fix... Will see if my Kindle's battery behaves over the next few days
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#10  the_callant 10-26-2020, 01:32 PM
I have also just bought an Oasis on Prime Day and have noticed a significant difference in battery usage when compared to my paperwhite and voyage. This leads me to the question, where is the toggle for the power saver mode on the Oasis 3?
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