I have HTC HD2 ported to android..

I have recently downloaded an app which can download torrents over the wifi, now I've been downloading movies (takes around 3 hours to download with 100kb/s) for 3 days, the phone gets really hot, most of the times I put it on charge and let the file download as the downloading drains the battery quite fast, and even the charging gets VERY VERY slow even at times the charging stays at one percentage maybe that's because the phone uses up too much of the power.

I wanted to know if its okay to give so much pressure on the phone all the day, even when it gets hot?