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The battery does not affect the picture quality. The recharageable battery may affect the auto focus if the battery is low, recharging the battery should fix this problem. Otherwise the camera needs a service.
This is just a possibility not really a solution: If the AF spot is aimed at a part of the picture lacking details, it cannot focus (all cameras are the same in that respect) Normally (I don't know the canon) there is an indicator to tell you if the camera managed to focus. It can be a beep or a dot which light in the viewfinder. I suspect that in your case you were aiming at something lacking details.
It's not the Autofocus, there's no 'non-engineer' fix. Lens and slider have failed, it's basically broken inside and I suspect it was the original fault. It's about £160-200 outside of warranty to fix via a canon authorised repair agent such as www.camera-repair.co.uk in Colchester. Send it back, get your money back.
I had the same issue and even if it sounds crazy giving a massage to the shutter button all around in circles helped and when you switch on the camera has no shutter lag again.
I hope it works as it did for me.
Backfocus problems will be magnified when using wide aperture lens with shallow depth of field, nice lens btw. Camera's adjustments for manual and autofocus are inside mirror cage behind mirror, and you dont want to risk getting dust on sensor or damaging sensor. Qualified camera repair shop or sending to canon for adjustment would be my suggestion.