Warranty for already warrantied item?

I had my ipad 6th gen replaced back at the end of December. They sent a replacement 6th gen and for a week I've I had problems with it charging super slow. I've bought new apple chargers and blocks and it takes 8 hours to get from 5% to 65%. I did a claim and it says I'm eligible for a replacement but once again have to pay 99$+tax for a replacement. I was just wondering if there was any sort of warranty for items already replaced? It'll be 200$ in 2 months for another ipad that could potentially have issues again.