Version 100.XX is the oldest la.. Like window 98 in computer then come version 200.18.xxx which like xp.. Then now 300.xxx which is like vista.. Ok.. Oldest is the least consuming firmware as not much update insert yet.. The more update come out the the more consuming lor.. But in version 2 n 3 nokia claim they insert update to stablize the energy usage but.. Most user still reported drop in their battery life.. Well with greater enhancement battery level is expected to drop unless provided during the period u r on new set of battery for every firmware update then i think u might not feel much different..but overall it wont last more than 1day half if u r heavy user who is constantly using wireless,3g,edge,web browsing,email sync all day long.. But a good battery will last u through d day and only required u charge after u finish u work.. Which is like a constant 10 hour workhorse like urself.. If u r a light user, and ur battery dont last.. Mean u either didn install something properly, or ur battery or phone is at fault..

For current firmware, are you satisfied with the battery performance?

Any Roadsync user here??  Just install the trial version.... It supports subfolders...