My iPhone X battery is getting quite worn out. Does it pay the get a third party battery installed. I know it is very pricey to use Apples own service.
I use a local guy ( Pulloxhill Beds ) he calls his business Bad Apple.
Over the years I have had batteries for my phones and tablets without any problems at all.
I'm fortunate in having a local techie repair shop near me - he's been in business for at least 15 years and is utterly reliable and trustworthy. You need to find a business like that - too many rip off merchants running market stalls that use rubbish batteries that won't last more than a few months.
I wouldn't hesitate to use third party batteries if I knew they were good quality but it's a gamble
If you’re on FB, go on market place and ask for recommendations. I have had countless devices repaired and new batteries installed by a local man who doesn’t have a shop, his reputation is fabulous - hope you find someone similar.