Yep I got my new iPhone 4 …
and when you’ve been around as long as I have and remember being categorically told in no uncertain terms to charge your new toys fully before use.  That was in the days when cell phones used NiCad and NiMH batteries and it was really deflating to take the new thing out of its shiny box and look at it charging every few minutes in anticipation of actually using it.  Those days have gone now…

Or have they?

The iPhone 4 and most other devices & cell phones now have Lithium Ion batteries  and they’re not affected by  “battery memory”.  These batteries can actually be damaged if you discharge them too often. Some say that they don’t need to be fully charged as they operate best when you hover between 30-70% charge/discharge.  However the battery meter does need to be set to give an accurate indication of how much battery life you have left and the only way to do that is to fully charge the first time.  If the battery meter starts to give you wildly inaccurate estimations of the time remaining try discharging it fully and recharging it to maximum.  You should need to do this more that once every 3 months or so.  Fortunately my iPhone 4 came fully charged straight out of the box so no waiting for me.  It remains to be seen whether it lasts me through the day and how many times it goes stone cold dead through overuse!
P.S. This is the bit that  am most interested in trying first is – video recording, HD (720p) up to 30 frames per second with audio. Yum!