Ok, more and more details are being added to the problem so I would like to sum up them a bit.
First, it would be nice that the user who created this thread, since he/she aknowledged that the help offered so far has been proved useless, remove the "Answered" mark (clearly not added by him/her), so that it gets evident that the problem is not solved
whatsoever.
Then, I had a narrow point of view of the problem, now I'm realising that there are more issues at stake.
Someone said that the problem was only a matter of battery lifespan, then replacing it is enough to receive correctly the notifications. Can someone else confirm this? In this way we are sure that the cause of the problem for this user is not different from
the others. Until now, another user said that he cannot solve the problem this way.
Another important issue is the operating system. I believed was a problem linked only to Windows 10 (no matter what update, am i right?), but now another user said he has the problem also with the solid 8.1. (This is not so surprising, since the thread has
been created in 2010, when not even Windows 8 existed).
My problem started as soon as I upgraded my laptop to Windows 10 in the 2015 summer (first build).
My laptop wasn't able to hibernate or to go to sleep mode, not only with low battery but even after a certain planned time interval ('go to sleep after x minutes of inactivity') so if I left the laptop unguarded, I found it dead with all my work lost. At first
my laptop was not able to enter these modes, but I managed to solve this by flashing and reflashing the bios. Now it is able to enter these modes, only when left unused but the battery problem still persists.
I have now reinterpreted its former behaviour in this way: it was unable to hibernate/go to sleep so it remained on until the battery problem came into play, killing the laptop, so it didn't die because of the missing functionality, it was just a consequence
that, in fact, is still present.
Now, as you can imagine, I'm using my laptop with the charger always plugged, and my battery got severely worn and out of calibration (but this problem leaves us no choice but using it never unplugged) : the lamp that signals that the battery is recharging
is always orange (so not full charge, but still recharging) and my battery level is stuck at 83-84%. Rarely, unplugging and plugging it again, it can reach the 100%. It recharges up to 9000-12000 (I guess they are mWh) vs the original 44000.
Unplugging it, the laptop could die even at 50-60% nominal battery level, no one can know or predict the level at which it will die.
At this point, maybe, the battery itself could be also a source of problem, but at the beginning, it wasn't so bad, it lasted at least one hour and when low it used to send a warning message and make the laptop go to sleep.