I have an old imac. I was trying to change the batteries in the track pad. The batteries must have leaked and I could not get it open, even with massive force

I have an old imac. I was trying to change the batteries in the track pad. The batteries must have leaked and I could not get it open, even with massive force. I learned my lesson on paying a premium for expensive accessories. So here is what I did. I just ordered the basic ipad yesterday for my kid's distance learning. They were pushing the pencil and keyboard hard. I did a quick search and found off brand pencils and keyboards that would work for a fraction of the cost. That is the route I went.