Hi marcipaans, sorry to hear about that these two laptop cooling pads you bought are not working well. Well there are two types of laptop cooler, a cooling pad may house active or passive cooling methods and rests beneath the laptop. Active coolers move air or liquid to direct heat away from the laptop quickly, while passive methods may rely on thermally conductive materials or increasing passive airflow. All you used are active coolers, i just found another laptop cooling pad from sourcingmap.com, a passive one, it says "Under natural conditions the compound in the mat will automatically reform as the temperature falls below 25 degree Celsius. Notbook Cooling Mat can work continually over 8 hours without any power supplies." Maybe it is a good choice for you, hope this helps!

Tiger Pattern PC Notebook Laptop Cooling Pad Mat Cooler