Aura How long should normally my device's battery last?

[Karaaslan]

Since this is my first post, hello, forum! I bought my first e-book device, kobo aura one, a month ago. First 10 days, I was very pleased with its battery as it lasts much longer than I expected. However, after a little break, less than 7 days, I saw my battery went down from %83 to %69, which I think is anormal due to the fact it was in sleeping mode. Then I began to read my epub book, I saw my battery went down to 66% after half an hour reading. The internal light was at 2%. To be fair, about 14% drop is much while sleeping for such device, but drop about 3% in half an hour is worse. I am not kind of those who fully charges their battery. I prefer charging my device to about 80% and maximum of %85, which I think is healthier. So my answer is, is it normal for my device to loss its charge at a rate of more than %2 per day and is the drop about 3% while reading okay?

Note: I used to use kobo start menu with koreader, then I deleted because I thought it might have caused the problem. However, after a night, I saw it dropped about 2% again. Well, I put in charge my device to be 100% now.

Note after a day: Well I fully charged my kobo then I put it onto my desk and left it for about a day. Although it hasn't been a day yet, my kobo have seen a drop of 3% from 100% to 97%. I didn't read book or use my kobo for any purpose. I am aware of the fact that it is not quite right to have these battery drains.

[Dryhte]

Don't worry about this, until after you've used to reader a few months (and charged it from around 20% to full a few times).

You have to give batteries some time to 'break in', they seldom have their full capacity from the start. Also, sometimes the batteries don't report their voltages very accurately. I don't put much stock in the percentages, I tend to view it this way:
- 100%-50%: weeks to go
- 50%-30%: if I planned a trip right now, I'd charge it first, otherwise, still good to go
- under 30% maybe I should consider charging it

[Karaaslan]

Originally Posted by Dryhte

Don't worry about this, until after you've used to reader a few months (and charged it from around 20% to full a few times).

You have to give batteries some time to 'break in', they seldom have their full capacity from the start. Also, sometimes the batteries don't report their voltages very accurately. I don't put much stock in the percentages, I tend to view it this way:
- 100%-50%: weeks to go
- 50%-30%: if I planned a trip right now, I'd charge it first, otherwise, still good to go
- under 30% maybe I should consider charging it

Well then it is better to wait and enjoy reading without thinking about battery. Thank you

[davidfor]

Just a comment about the battery usage. Kobo was originally quoting 30 days battery life for the Aura ONE (they now say "last for weeks"). This was based on 30 minutes of reading per day. Or about 15 hours in total. And that means that an hour of reading should use about 6% of the battery. But, exactly how fast the battery is used is most affect by how fast you turn the page. Fast readers will use the battery faster than slow readers.

[the.Mtn.Man]

Originally Posted by Dryhte

You have to give batteries some time to 'break in', they seldom have their full capacity from the start.

I'm not sure this is true. Rechargeable batteries, including those installed in electronics devices, are always sent at least partially charged from the factory to prevent the battery from over-discharging while it sits on a shelf, but in my experience, you always get full capacity the first time you charge it. There's no "break in" period. It might seem that way, but I suspect it's a matter of perception because you're more likely to use a new device more often which will run the battery down faster, and once the novelty wears off and you just use it normally, the battery will last longer.

The rest of your post appears to be correct, that the charge indicator on an electronic appliance represents an estimate rather than a precise value.

[Dryhte]

Originally Posted by the.Mtn.Man

I'm not sure this is true. Rechargeable batteries, including those installed in electronics devices, are always sent at least partially charged from the factory to prevent the battery from over-discharging while it sits on a shelf, but in my experience, you always get full capacity the first time you charge it. There's no "break in" period. It might seem that way, but I suspect it's a matter of perception because you're more likely to use a new device more often which will run the battery down faster, and once the novelty wears off and you just use it normally, the battery will last longer.

The rest of your post appears to be correct, that the charge indicator on an electronic appliance represents an estimate rather than a precise value.

I always have the feeling that new batteries last longer after they've been charged fully - and at least substantially discharged, say to 25% or so - for a few cycles.

However, I'm not hindered by any scientific knowledge about this

[davidfor]

Originally Posted by Dryhte

I always have the feeling that new batteries last longer after they've been charged fully - and at least substantially discharged, say to 25% or so - for a few cycles.

However, I'm not hindered by any scientific knowledge about this

Li-Ion cells have no memory effects or need to be primed in any way. But, the battery gauge can need to be calibrated to be accurate. Doing two or three full cycles is usually enough to do this.

[Richwood]

Originally Posted by Dryhte

I always have the feeling that new batteries last longer after they've been charged fully - and at least substantially discharged, say to 25% or so - for a few cycles.

However, I'm not hindered by any scientific knowledge about this

I have had several older Sony readers recently bought that had very quick self discharge as received, like 48 hours or so. Battery too low to turn unit on. After a dozen or so charge and discharge cycles the batteries are much improved. The best are still showing full charge bars after 4 days since being charged. I am watching several units to decide which one to try replacing the battery on first.

[Karaaslan]

I noticed that if I do not set the light level to zero before I put it into sleeping mode, the battery behaves the way I mentioned, draining. However, if I set the light level to zero and then put it into sleeping mode, the battery percantage remains the same for a long time. I thought there might be a problem about sleeping mode. In addition, I use sleepcover, I ensure that it went into sleeping mode by pressing the sleep button first.

[the.Mtn.Man]

I notice I never actually answered the OP's question. In the case of my 4-year old 1st generation Aura, the battery lasts for weeks, but I don't read extensively every day. I usually charge it when it gets below 30% or so.