One of those things (along with Micro-SD slot) that is a must have for me on a device.
Have carried a spare with every BlackBerry device I've owned starting with the 8320.
Carrying a spare battery is a no-brainer with the Q10 since the battery bundles for $12 on Amazon.
[Hopefully NOT edited by admin to be fair lol. ] Frosty White Q10/10.3.1.2267 CB10