Renew/replace battery on N20U Exynos in UK.

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Is it possible to put a new battery in N20U Exynos? I've read somewhere that it is not possible, surely this is not correct. Reason I ask is that if there is no Note 21, I would wont to keep this phone for as long as possible. they cost a smalll fortune. My battery health is at 91% according to AccuBattery and I'm not a heavy user. If it is possible does anyone know the best place to get it done, I only have a local phone shop and I doubt they would do it. Thanks for any replies in advance.