N80 v5 firmware and dire battery life

Updated to the v5 firmware for the N80 (5.0719.0.2) and apart from the annoying loud warning tones, the biggest problem I have with this is the extremely short battery life now.
Charged last night, left on standby for maybe 10 hours, and the thing is flat in the morning!
I doubt the battery has suddenly died. Before updating to v5, the phone would last several days on standby.
I can't see that it is connecting to any access points during the night. Bluetooth is off. WLAN scanning is off.
I know the N80 is old now, but anyone found a solution to this or have some tips?
Only other thing I can think of doing is a total reset of phone and media memory, and reinstall everything from scratch.
E72-1 UK CV 052.005

I have had V5 on my N80 a year or more now and there is definitely no reduction in battery life.
Make sure that things you don't normally use like 3G, bluetooth and wlan scanning is switched off. If this doesn't work then try resetting and failing that, reinstall V5.

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