Currently at work we use (mostly T 4xx/5xx series) Lenovo laptops with rectangular power connectors [1]. I have mine for ~2 years, was used ~year prior. I conne

Currently at work we use (mostly T 4xx/5xx series) Lenovo laptops with rectangular power connectors [1]. I have mine for ~2 years, was used ~year prior. I connect/disconnect charger multiple times a day and both ports are sturdy as new. Others state similar feelings. [1]: http://shop.lenovo.com/ISS_Static/options/US/images/17912239369_61732_20130906114835.jpg http://shop.lenovo.com/ISS_Static/options/US/images/17912239...