[covard]

I am really surprised that none of our "geeks" have answered your question here.

This is the standard design of the phone. I have had mine for more than half a year now, and I get this message all the time. I don't think it has anything to do with the "calibration" of the battery.

I get the one message when it hits 40% and at that level there don't seem to be any items that are affected by it. It seems to be just that, a warning message.

At 20% of battery life, it sends another, more stern warning. Also, the bluetooth cannot be enabled at 20%. This message continues interrupting more often.

Again, that is the design of the phone.