I bought a nokia c5-00 this January , initially the battery backup was too good (roughly 3-4 days), now suddenly its decreased to 1 or 1.5 days.. I'm not using packet data,Fm or anything else running in background, not even music.. My usage is around 100 texts/day and some 20 min talk, that's all.. If my phone can't last for even 2 full days with this normal usage then its too bad.
I installed energy profiler app and under than in Settings > Battery capacity > This phone .. It reads only 946mAh but my battery is a 1050 mAh battery.. Its original nokia battery .. Why is it so?? Is this an indication of any problem??
Also only the first bar in battery indicator takes time to go otherwise all other bars are going off in a few hours..!
so two things. Firstly, all rechargable batteries loose max capacity over time and have a maximum life of about 18months to two years.
Secondly, Nokia charging bars have traditionally dropped one bar when half the battery capacity has gone, then the remaining bars cover the other half of the battery capacity.
I used to have the same problem with short battery life of my Nokia C5-00 which bothered me for almost a year. I found in internet an application called Energy Profiler v1.23 which measures the consumed energy and shows it in a graphic. It is really awesome. Then I spotted that my phone consumes about 0.22W/h power for a period of 15s every 3 minutes. For comparison reasons it consumes about 0.09W/h when the display is active. So after some research of the applications I found out that this power consumption comes from the automatic updates of the software. By default the setting is ON. The path to it is:
Home->Settings->SW Update->Options->Settings->Auto-check for updates->Off
Here we go! After this setting is set to "off" my phone is working for 2 weeks with a single charge and it consumes less than a 0.01W/h in standby mode.
The C5-00 battery life is nothing like the promised 600+ hours, in practise it's under 100 hours (=less than 1/6th of the promised duration!) when not using the phone for ANYTHING, i.e. just keeping it on the table in standby. This is with no extra power consuming apps on (such as Bluetooth, GPS, email, etc. - easily confirmed from the phone's menu "open apps"), and with full network bars. Actually using the phone (a couple of SMS and/or short calls a day, at most) cuts down the battery life markedly from the above.
The C5-00 has been like this from the start, and the performance did not improve at all after first replacing the phone by the reseller, and later also trying with a new battery. I find it highly unlikely that I would have been so unlucky to get two flawed/malfunctioning phones and/or batteries. Phone firmware is the latest 071.005 (upgraded last summer, but it had no effect on power consumption). At first the above suggestion of Automatic updates seemed promising, so I checked but it's set to 'off' already.
So either there's some serious
a) flaw in the phone firmware (or phone components?) causing extra power consumption
b) truly subpar quality of the BL-5CT batteries (if so, does Nokia have any product quality control at all?!)