I get that argument from hubby who loves his and refuses to move into the current century. The new iphones /smartphones are way better on batttery life these days. 48 hrs no problem on mine.
I charge my Z10 nightly but I think from the amount remaining it would, just, do 48 hours. Of course the beauty is a few years ago, I'd have been carrying multiple devices around to achieve the same as the Z10 provides.
Still, I used to like that the old Nokia could be taken on business trips without the charger
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Steve Parry
Current fleet: '14 F800GS, '87 R80RS, '03 R1100S BoxerCup, '15 R1200RT LE Dynamic, '90 K1, '05 K1200S
Maybe I should replace the battery in the bike with a Samsung S4 , useful but passers by may think I have lost it if I kneel by the bike at the side of the road talking to myself.