Battery Charger Gets Hot

Is the battery charger supposed to get hot? I was unplugging the cord from the cart and noticed it was rather warm, then when I picked up the charger it self it was "hot". Not to hot to pick up by the handle, but hot none the less. Is this normal? I had been out in the cart earlier in the day and had plugged in the cart when I came back to the shop. I was going out in the cart again when I noticed it was hot.

Thanks in advance for your replies!!