IFixit sells the battery [1] for £130, they also have a useful guide [2], though it being Apple, repair-ability is rated difficult and requires many tools, so a

IFixit sells the battery [1] for £130, they also have a useful guide [2], though it being Apple, repair-ability is rated difficult and requires many tools, so an independent repair shop is probably your best bet. [1] https://store.ifixit.co.uk/products/macbook-pro-15-retina-mid-2018-2019-battery https://store.ifixit.co.uk/products/macbook-pro-15-retina-mi... [2] https://www.ifixit.com/Guide/MacBook+Pro+15-Inch+Touch+Bar+2018+Battery+Replacement/122269 https://www.ifixit.com/Guide/MacBook+Pro+15-Inch+Touch+Bar+2...