Just to show how much betterer smartphone batteries are, and their power handling, I bough a Nokia N95, because every review raved about how good it was, what it could do, yada yada yada.
It was utter crap. The battery life could be almost measured in minutes, if the phone was actually tasked with anything, and the GPS could only function if the keyboard was slid open, so in order to actually use it for navigation you then needed a BT GPS receiver, which meant having BT on, which meant approximately two hours use on one charge. If you were lucky.
Same with music; I had an 8Gb card in mine, with maps and music on it. If I walked up town playing music, after two hours, the battery was dead, so in order to get any significant use from the damned thing, I either needed four or five spare batteries, at £20+ a go, or a larger capacity battery, which needed an enlarged case back, which couldn't hold the battery so tightly, allowing the SIM to lose contact, meaning no phone calls...
And the camera was a useless piece of crap that could barely focus on a barn door; it couldn't focus on a 70 foot sailing ship in Bristol harbour, or my bike propped against a tree!
Compare even an iPhone 3G, let alone a 4 or 4Gs against that woeful piece of crap, and it's amazing just how far the tech has actually come in a relatively short time.
For which I'm very thankful, considering how much I use my phone every day.
I rather wish Nokia had kept developing their new OS; that phone of theirs with the 42Mp camera is awfully tempting...