I just witnessed an interesting battery phenomena so I thought I should share it with all of you guys here. You know how everyone says the battery life sucks, and how you need to do everything from disabling the LED's, 3G to even Internet (yah on an Internet phone) to get the maximum battery life. I followed a bit of that too, and what I discovered along the way was irrespective of what I did (Autodisconnect), disable Wifi the battery would discharge at pretty much the same rate even in Standby, draining about 20% in 8 hours without much activity (like no IM etc).

But then something changed over this whole week, the battery is draining only 1% per hour (sometimes even less) in Standby - connected all the time to the Internet via WiFi, checking mailing via Nokia Messaging which means, I could probably use it this way for about 80-90 hours (or 4 days!!!), which is good enough for me!

My best guess is all this has to do with somethings I have changed, though it will difficult to pin-point which one did the magic. So, here's what I have done, what worked and what didn't, it might just help you.


1. Installed Autodisconnect. Not much change in standby time, but 5-10% improvement.

2. Disabled GPS. Not much change in Standby time.

3. Change Wifi transmission power to 10mw. Not much change, or nothing noticeable. In fact it made it more difficult to connect from several places in the house.

Now on to some of the things which may have changed the battery.

4. Reflash to 1.2 (eMMC as well). Changed battery performance by about 10% straight away

5. Reset my Wifi router. Change from Mixed mode to Wifi G mode only.

6. Disable IMAP mail checking and setup Nokia Messaging. I thought this would reduce battery life, but this is what I am using now while getting 4 days of standby time.

7. Discharge battery fully couple of times, and recharge.

8. Change Wifi Power saving setting to Intermediate

Currently I am getting 4 days of standby with the following settings.

GPS & Network Location On, Wifi Powering Saving set to Intermediate, Autodisconnect disabled, N900 connected to Wifi all the time during Standby, Nokia Messaging Mail configured with one IMAP account, Phone mode set to GSM, Brightness set to 2.

I am sure it's one of the things I have done. But it's amazing. I even timed with light load, a few hours of calling, 1-2 hours of Wifi browsing and I am getting 2 1/2 days.