Hi,how can i replace my iphones battery in city van,turkey?

Try to Call Apple in your region see: Contact Apple for support and service

Contact Apple for support and service - Apple Support

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Türkiye2

00800 4488 29878

2.If you use a mobile phone to call a toll-free number, you might be charged. The number might not be accessible from certain mobile network providers. For more information, contact your network provider.

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The battery can be replaced by Apple or an Apple Authorized Service Provider.

See this Apple article: iPhone Battery Repair & Replacement - Apple Support

If you are going to replace the battery, see -> Get your iPhone, iPad, or iPod touch ready for service

Get your iPhone, iPad, or iPod touch ready for service - Apple Support

The price is approx $ 69.

If you want to know exactly, call Apple directly, see Contact Apple for support and service -> Contact Apple for support and service – Apple Support (UK) 

or 

call 1-800-MY-APPLE