Battery indication seems incorrect

iPhone 5S 64GB, just over one year old.  iOS 8.0.2 (12A405).
Battery indicator seems to have gone really weird - it'll be displaying anything from 10-25% and then the phone will just switch off and need charging.  It'll then come back on (after a short charge) and the indicator will be where it was when it switched off.
I've tried a full discharge and recharge, not disconnecting until at 100%, and then a phone reset.  Also tried charging using a selection of chargers, including my MBP, but this has been going on for a few weeks now...
Any

Depending on the use of the phone, could be a battery issue. If you can, visit an Authorized Apple Service Provider or Apple Store to get it checked.
Changing the battery will cost you around $79:
Model
Out-of-warranty service fee
Battery service*
iPhone 6 Plus
$329
$79
*available only if battery
fails Apple’s diagnostic test
iPhone 6
$299
iPhone 5s, iPhone 5c, iPhone 5
$269
iPhone 4s
$199
iPhone 4, iPhone 3GS, iPhone 3G,
Original iPhone
$149
Plus a $6.95 shipping fee, if required. Fees are in USD and exclude local tax. Pricing is for service through Apple. The final service fee we charge will be determined during testing and may be less than the service fee listed above. Pricing and terms vary for service through an Apple Authorized Service Provider.
copied from Apple - Support - Service Answer Center

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