The 8 hours and 20 minutes of talk time that the new all-touch 'Berry tested out at put it just 20 minutes behind the Apple iPhone 5. But the BlackBerry Z10 was hours behind some of the new handsets with huge batteries like the Oppo Find 5 (14 hours, 17 minutes) and the LG Optimus G (15 hours, 30 minutes). The first BlackBerry 10 model does better when it comes to web browsing. With Flash disabled for the test, the highly rated browser on the BlackBerry Z10 lasted for 6 hours and 27 minutes which is a far cry from the nearly 10 hours that mobile Safari lasted on the Apple iPhone 5 before the battery conked out. But it is more than double the puny 3 hours that the battery lasted while browsing on the Samsung GALAXY Nexus.
Motorola RAZR MAXX (running on Android 4.0) was able to last, the 'Berry outperformed the Motorola RAZR i, the HTC DROID DNA and the Nokia Lumia 920.
So overall, the BlackBerry Z10 will probably get you through the day with moderate use. But considering that BlackBerry wants this phone to be all things to all people (consider the BlackBerry Balance feature), bringing along the charger and scouting for an outlet might come in handy. One thing that the BlackBerry Z10 has that many of today's flagship phones don't is a removable battery. So when you look at battery life this way, you can always replace the battery with a fresh one or with an extended battery once they are offered.