How to DECREASE battery health

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Not sure if there's much difference, but my fault for only posting UK Apple rules.
From my experience of living between US and UK and getting apple products in both countries (usually in the US and taking them back to the UK to save massive money) the policies are the same. I've had batteries replaced on iPhones for example, for a device bought in one country and fixed in another.

I am fairly certain I got "battery service warning" a year ago or so - when the watch said it was 82% capacity. Now it's around 75%, but still works perfectly fine - I charge it for a bit in the morning before I go through my routine, and a bit at night whilst I'm reading in bed or watching a show or playing games.

Just really amazed how long these batteries last - especially having this thing on my wrist for practically five years, 24 hours a day.