The battery needs to be worse than 80 % for them to replace it for 29 bucls me thinks like you cant just walk in there and be like y‘all i want my battery replaced just because i feel like my phone is being slow
But that's why Apple would verify that the battery is healthy or not, which they won't replace a battery just because you feel like your phone slow if the battery was actually healthy, which something else could be contributing to the lag. It's called troubleshooting.