N97 mini battery level drops suddenly

I've observed my N97 mini's battery level dropping abruptly from 4 bars to 1 bar (with low battery alarm). The phone's slightly more than a month old and using the latest 11.x.x firmware. Did a bit of googling, and found several suggestions on how to save battery (turn off everything 'smart' on ur phone). That's not the point anyways. I need to find out why the battery level drops suddenly (like what happens when ur battery's dying out), and *not* why the battery lasts X hrs. I'm not sure about this, but I think this mostly happens when the battery level is slightly below max, and I use any app that needs the GPS functionality. But then, there doesn't seem to be any problem with the GPS hardware in the phone, 'coz it usually gets a GPS lock in less than a minute (mostly within seconds). Could it be related to the algo used to show the battery level, or is it that its my battery that's faulty? Any others out there having the same problem?

It's understandable that the batterymeter is not linear (atleast the charge/discharge rates are not). But what bugs me are those sudden erratic drops within minutes (a couple of minutes at times). Anyone who has spent a few days with a dying (rechargeable) battery would know what I'm talking about. It's not a good feeling when u r away from a charge source, and you decide to use one of those power hungry things (like Wifi/GPS) thinking you still have sufficient juice left...and then bam! ... the low battery warning! you just switch off everything, and hope that it lasts till you reach the next oasis. I guess I'd have to analyze this a bit more to understand if its some specific app that causes such behaviour (as mentioned in my original post, i doubt the GPS apps currently). If it happens too often, and even with 'normal' voice+text kind of usage scenarios, its time see Nokia Care I guess. The reason for this post is to know if this behaviour is observed by other N97 mini users as well..then I know there's no point in taking it to Nokia Care.

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