I provided my HP Probook laptop with a 9 cell 6900 mAh battery, which obviously gave good autonomy. I always keep it plugged in to the charger.
I noticed (and I guess that is due an embedded function in the BIOS or in the battery’s circuit) that as soon the battery percentage reach 97%, the charging process restarts: I mean that as 100% is reached, the charging process stops, and until 98% is obviously reported “plugged in, not charging” and when 97% is reached, the charging process starts again. I utilize such laptop for several hours during the day (I would say for about 8 – 9 hours) and I see such process (charging from 97% to 100%) for about two or three times. I have to say that this charging process from 97% to 100% takes almost/less than 10 minutes: is very quick, so – at least in terms of temperature – the battery shouldn’t suffer too much.
What makes me puzzled is to see these brief charging sessions every day, and by searching on some guides and how-to about properly keep laptops batteries, seems that to maintain a wise lifespan of the battery, the charging sessions should be reduced, but is not my case, and I fear that on the long term, the battery will last less than normal.
Furthermore, on the HP Notebook PCs - Improving Battery Performance's page, they claims:
To protect the battery from multiple, brief charging sessions when you connect the power cord, the battery does not begin charging until the charge falls below 94%.
But in my case, this happen on 97%.
So, here main questions: maybe would be a good practice to unplug the charger after that battery reached 100% of the charge and plug it again, eg, on a lower percentage, like 40%? Or maybe even better (as someone else claims) keep in the 40 - 80% range? I cannot figure out, in terms of strain and battery's lifespan, if is better to do these brief and quick charging sessions for 2 – 3 times at day (from 97 to 100% in about 10 minutes) or lessen them at the cost of more time spent in the charging process (should take about 1 hour to go from 40% to 100%), and so increments the charge/discharge cycles, which could also increase the battery’s temperature (more time spent in the charging process).