I would like to know why iPhone 4S Battery backup has been reduced after updating it to 5.1 firmfare

When i bought it, i was getting a gud battery backup of 2 days. Based on my usage.
Even now after updating the firmware my usage is same as before.. but the battery drains very fast...

Hi aznur,
Article: HT1476 iPhone and iPod touch: Charging the battery
http://support.apple.com/kb/ht1476
Charging with a FireWire-based power source is not supported, except on original iPhone and iPod touch (1st generation). If the device is connected to a FireWire-based charger or accessory, this alert screen will appear:
Charging is not supported with this accessory.
Have a nice day,
Mario

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