SSD sutts off completely and shutts off PRAM

ok hi everyone, I upgraded to a Samsung 830 SSD, and for some reason when my macbook pro (late 2011 15 inch) loses battery, it finishes at 0%, exellent battery life. but after I trn it on and the date and time is wrong, it gives me the idea that the macbook loses the battery completely, and the PRAM gets reset.