iRex 800 quickly discharging

[jolka]

>I've started such a test yesterday evening: https://www.mobileread.com/forums/sho...2&postcount=76

Ok, -3% in 12 hours - this would roughly make 33 * 12 = 396 hours, or ~16 days in Standby. That's in line with my DR800S, even a bit better

[mgmueller]

Originally Posted by HarryT

A fundamental difference, though, is that you can switch the Neo off if you don't want your battery to drain. I understand that there's no way to switch off the DR800?

That's right - and a bit odd.

[pietvo]

Originally Posted by mgmueller

(In BeBook Neo I had the stylus inserted, so this can't be an explanation there.)

See my reply in the other thread.

[mgmueller]

Originally Posted by jolka

>I've started such a test yesterday evening: https://www.mobileread.com/forums/sho...2&postcount=76

Ok, -3% in 12 hours - this would roughly make 33 * 12 = 396 hours, or ~16 days in Standby. That's in line with my DR800S, even a bit better

If it's linear - and this will be the interesting thing to watch. I'm really curious, whether I'll be able to reproduce the fault or whether it will make 10 to 15 days this time. I didn't have the problem before in the 6 weeks I've got my 800S, so probably just a single fault. (Even more annoying though. I'd like to know what has happened.)

[mgmueller]

Originally Posted by pietvo

See my reply in the other thread.

Strange thing is, that your wife's Neo seems to behave differently. I'd understand differences of, let's say, +/- 10%. But some reporting 15 days and others having 3 days?

[pietvo]

Originally Posted by mgmueller

Strange thing is, that your wife's Neo seems to behave differently.

I am watching them both, after having them charged fully. Up to now they seem more or less equal. Earlier I hadn't done a controlled experiment.

[mgmueller]

Originally Posted by pietvo

I am watching them both, after having them charged fully. Up to now they seem more or less equal. Earlier I hadn't done a controlled experiment.

Then your experience seems to be in line with other reports from the BeBook forum. Personally, I find 3 or 4 days extremely low. Way lower than on non-WACOM units. Most users report way longer durations for iRex 800 as well. I'll continue my test on iRex 800.

[badbob001]

Originally Posted by HarryT

A fundamental difference, though, is that you can switch the Neo off if you don't want your battery to drain. I understand that there's no way to switch off the DR800?

I wonder if there is a software command to shutdown the device...

[cmdahler]

Originally Posted by The Straven

Most of the posts I've seen you make in this sub-forum decry iRex.

Yes, they deserve it.

It's clear that you have no interest in iRex devices.

That's incorrect: I was very interested in the 800 when it was announced - the constant delays and the incredible corporate ineptitude earned my scorn. Is your beloved company so perfect that it may never be criticized? I would actually consider purchasing a 800 in the future if the company could ever get its collective thumb out and deliver a product that is actually worth the price they are charging for it: at the moment, it's worth maybe half.

Claiming to be ribbing Shaggy is disingenuous. Accusing someone of being a shill isn't funny. And a couple years of lurking here and owning an iLiad or now a DR800 has convinced me that Shaggy is not a shill.

Why, because actually owning an iRex device somehow gives you a deeper insight into all things Shaggy? Give me a break and get a sense of humor.

feel free to report this post

That would imply that I care.

[cmdahler]

Originally Posted by mgmueller

If it's linear - and this will be the interesting thing to watch. I'm really curious, whether I'll be able to reproduce the fault or whether it will make 10 to 15 days this time. I didn't have the problem before in the 6 weeks I've got my 800S, so probably just a single fault. (Even more annoying though. I'd like to know what has happened.)

Generally speaking, of course, battery drain isn't linear. Most types of batteries have a fairly steep falloff near the end, correct? I know my daughter's insulin pump needs to know the type of battery we are using in it so it can accurately display the battery meter as the voltage drops off since the curve is apparently very different from one battery to the next.

[mgmueller]

Originally Posted by cmdahler

Generally speaking, of course, battery drain isn't linear. Most types of batteries have a fairly steep falloff near the end, correct? I know my daughter's insulin pump needs to know the type of battery we are using in it so it can accurately display the battery meter as the voltage drops off since the curve is apparently very different from one battery to the next.

Question is, whether the meter actually measures the battery in real-time. Or whether the meter is some kind of "counter", which simply makes a few "snapshots" and does linear interpolation inbetween.

[HarryT]

Originally Posted by mgmueller

Question is, whether the meter actually measures the battery in real-time. Or whether the meter is some kind of "counter", which simply makes a few "snapshots" and does linear interpolation inbetween.

I did a "battery drain experiment" on my CyBook Opus a few months ago, to see how long it would last on a battery charge when left permanently on (it was just over a week). The battery meter readings were VERY "non-linear" on that. It sat at 100% for about 3 days, slowly fell over the next three days to 40%, then fell from 40% to zero in the course of 1 day.

[cmdahler]

Originally Posted by mgmueller

Question is, whether the meter actually measures the battery in real-time. Or whether the meter is some kind of "counter", which simply makes a few "snapshots" and does linear interpolation inbetween.

One would think, of course, that since any particular company has control over and thus knows the discharge profile of the battery in the device, it would be fairly simple to take snapshots of the battery's voltage every few minutes or so (or with an e-ink device, every time a button is pressed), and just compare that to the battery's known voltage drop-off graph for the battery type to get a fairly accurate picture of where the battery charge is on that profile. That way the meter could display a charge level to the user in a more accurate, linear fashion that would make more sense to the average person instead of getting what HarryT described.

[jolka]

I am following mgmueller's experiment - I think it would be better to check the battery level over equal periods of time.

Switching the device on/off and checking the battery is like four complete screen refreshes. 8" screen refresh takes almost the double of energy needed to refresh a 6" screen, I mean, it takes quite a lot of energy, and apparently introduces by itself extra non-linearity, and then doing that over unequal periods adds some more non-linearity.

[mgmueller]

Originally Posted by jolka

I am following mgmueller's experiment - I think it would be better to check the battery level over equal periods of time.

Switching the device on/off and checking the battery is like four complete screen refreshes. 8" screen refresh takes almost the double of energy needed to refresh a 6" screen, I mean, it takes quite a lot of energy, and apparently introduces by itself extra non-linearity, and then doing that over unequal periods adds some more non-linearity.

Probably would be more accurate, you're right. But my main goal is to track, whether I'll make 4 or 14 days. This time, I'm 100% sure about having it fully charged and about the time I started at 100%. Be it 13.5 or 15 days - I wouldn't mind. But if it's 4 days again...