I had a Dell Inspiron 6400. My roommate bought one 6 months after me. I "religiously" removed the battery when my device was plugged in. I also "fully" discharged it once a month. My roommate left his plugged in all the time. Guess what happened? His battery failed 8 months before mine.
I started plugging mine in all the time, and the battery lost a lot of capacity (75%) 3 months later.
Sure, not scientific, but definitely shows positive results for not constantly charging.
I started plugging mine in all the time, and the battery lost a lot of capacity (75%) 3 months later.
Sure, not scientific, but definitely shows positive results for not constantly charging.
Yes.. they loose capacity over time if you keep draining to "zero"
Here is a good paper on it:
http://www.che.sc.edu/faculty/popov/drbnp/website/Publications_PDFs/Web33.pdf
"A typical chart from industry studies, in this case from the Department of Chemical Engineering, University of South Carolina, Columbia (PDF link). The amount of theory behind the topic and the number of variables are somewhat very scary, but you can take from the chart above that as the number of battery charge cycles goes up, the voltage, capacity and performance all decrease dramatically - starting at 1800mAh, the tested battery was down to 1350mAh after (roughly) a year of simulated use."
Click to view quoted image
So keep it plugged in at all times if you have to, but don't drain it out every day... that is if you are actually keeping the phone, since the battery is sealed there is no way for an easy replacement. And.. even if you are exchanging it, I don't know if Nokia replaces the batteries when they refurbish the phones.. so, someone else might end up with your tortured battery.