Battery drains

Some time ago, I once asked here whether my iPhone could get a virus from clicking a link in a phishing email. This morning I saw that my battery health was at 88% (Iphone 11 ios 15.3 since november 2019), and I've read that a low battery health or battery that drains out quickly is a symptom of an iPhone being hacked due to some stuff happening on the background. The thing is, I don't remember my battery health prior to the phishing incident. What should I do? Should I be worried?