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Standard phone warranty covers manufacturing defects, not normal battery wear and tear - and after 2 years we're almost always in "wear and tear" territory. The battery is a component that degrades over time regardless of how you use it, so most manufacturers (Apple, Samsung, Google, etc.) exclude it from traditional warranty after the first year, or only offer protection if capacity drops below a certain threshold (like 80%) within 12 months.
What you can do: check if your phone qualifies for any extended warranty or battery protection program (some phone carriers add it, or Apple has AppleCare+ that covers a couple of replacements). If not, a battery replacement usually costs between €50 and €100 at an authorized service center, sometimes less at independent shops (though you risk losing warranty on other things). If the battery actually starts failing (it swells up, phone shuts down randomly) then yeah, it could be a covered defect - but you'll need to have it checked by an authorized technician.
Check the documentation you got with the phone or the manufacturer's website for the exact details of your warranty, because every brand has its own rules and they vary by country too. Sometimes just sending an email to customer service asking if it covers your specific situation is enough.
Standard warranty typically covers manufacturing defects for up to 1 - 2 years, but battery wear after 2 years usually falls under natural degradation and isn't covered. Still, try contacting the manufacturer with your receipt though, because some brands offer discounted battery replacement programs even outside warranty.
After 2 years the battery is pretty much always considered normal wear and tear, but it's worth contacting the manufacturer anyway because some makers offer replacements at a reduced price if the capacity has dropped dramatically (like below 70-80%). It doesn't cost anything to ask.
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