IPhone 4S - phone switches off before battery percentage has got to 0

iPhone 4S - phone switches off before battery percentage has gone to 0 - usually switches off when it's between 20-30%.
When I try the force restart it has the battery sign.  (Home Button+Power button)
When I plug the charger in it starts charging  from the point it shut off, 20-30%.
Have tried reset all settings.
Have done a restore and setup as a new phone.
Any way I can get it start charging from 0 instead of where it shut off (20-30%) ?

Bit of a trek to the Apple store + i can't really send it off as I'm using it all the time.
Anything I can do to recalibrate or reset it so battery drains and starts to charge from 0, before I have to go to the Apple store?

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