How to calibrate iPhone battery?

My 6 month old iPhone 5 battery registered 67%, then I was recording a video for all of 2 minutes
when suddenly my iPhone shut down.
Surely my battery is ok. I think the battery needs re calibrating to give a more accurate representation of battery status.
How do I do this?
Thank you.

ok, here you go
Lekz1 wrote:
Hi Platnum K,
I'd like to try your method of hard resetting my phone however my sleep/power button doesn't work.
Do you know if there's a method of hard resetting the phone using assistive touch or if there's any other way of doing it?
Luke
Tap the Assistive Touch button, Tap Device, Press and hold the Lock Icon
The 'Slide To Turn Off' should then appear, use it to turn the phone off, wait for a minute or so then
plug the phone into your computer or into the power adapter - the phone should then come back on.
Hope this is of some help.

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