I purchased Dell Inspiron 15R 5521 2 years ago. From the first month itself i have realized some problem related with battery. Those days, if my laptop was running on battery power (not plugged in) , when I close my laptop lid and open it,  the battery info used to show 250 hrs remaining and so. I thought it might be operating software problem. Now for last 2 months the battery is not charging upto 100% and its showing around "80% available, plugged in, not charging". I did a full format using windows 8.1 disc one week back but still the battery problem exists in my laptop. I tried updating bios using the latest bios file available in the driver site, but didn't make any difference. Please help me to solve this issue.