Inkpad 3 dead on battery, but fine on charger

[bpbiszkopt]

I'm also using cover with magnetic cover and it works ok.
But I'm using old firmware from 2019 5.20.1010

[VladimirS]

I read here on Pocketbook forum, that some number of Pocketbook devices (all models included in analysis), as high as 5 percent, have some kind of hardware problem that requires tehnician in service
to repair it, or replace it with completely new device.

Return rates for other eink devices (brands) are probably smaller, if their customer service is honest and does not hide potential problems with some particular brand.

@joepie
I did not know that Inkpad 3 has some kind of sensors to distinguish between closed and opened cover...

[joepie]

Originally Posted by VladimirS

I read here on Pocketbook forum, that some number of Pocketbook devices (all models included in analysis), as high as 5 percent, have some kind of hardware problem that requires tehnician in service
to repair it, or replace it with completely new device.

Return rates for other eink devices (brands) are probably smaller, if their customer service is honest and does not hide potential problems with some particular brand.

@joepie
I did not know that Inkpad 3 has some kind of sensors to distinguish between closed and opened cover...

Thanks for the inquiry about the return rates. Unfortunately, there are also other strange problems, like the my firsttime ereader Pocketbook 302, that missed some kind of UV-filter in the screen and in full sunlight, some of the black pixels wouldn't turn black when turning the page. So the text was kind of malformed. Not unreadable but quite ugly. That was in some of the batches, and I was a lucky winner of the bad ones .

I think there is something wrong with quality control if a brand accepts 5% returns. Some brands don't take the quality as serious as others.
I'd just rather venture to try other brands and see if my luck is better. I tend to stick with the brands that last like for always. More expensive to invest initially, but far wiser in the long run.

Anyways, my Inkpad 3 just started to misbehave after working fine for two days. It's time for me to move on.

Bye Pocketbook, and thanks forum friends for sticking around and maybe see you in other subfora. I will miss the good parts of Pocketbook including the community, but I will certainly not miss any of the problems.

[VladimirS]

Originally Posted by nhedgehog

Voltage of 3,88V at 100% without getting some charges out of it tells you nothing, except that it is a little low.

I read that around 3.75 V should be at roughly 50-60% or healthy battery.
Fully charged should be 4.2 V.

I think great deal of problems come from estimating
real state of charge of lipo battery.

What is real (technical, electric) meaning of 100 %
in context of real battery probbably used many years.

Can you, please, elaborate a little bit about this issue.
It looks like you have real experience with hardware ...

Thank you in advance from all of us with this kind of problems !!!

[VladimirS]

I did one rather unusual test.

Got a Android flip phone from 2005, (LG U8330) I removed battery (20 years old),
original, Japan made, OEM for this phone.

It performed a way better than 1 year old aftermarket battery sold on Amazon.
These are real crap, not worth money, really.

During page turning process in Inkpad 3, voltage drop was 3-4 times lower
than new aftermarket one. Page turning is power hungry, causing substantial current draw.

E-reader (Inkpad 3) worked like a charm. No freezing, no any previous problems !

This is insane

I feel that these low cost, aftermarket batteries are totally worthless,
especially in devices susceptible to low quality voltage source.

I suspect that Pocketbook user (significant number of them) facing freezing
problems during device usage may face similar situation with subpar battery quality.