The 3-cell is out of stock, but if you do not have a 2.5" drive in the system, a 6-cell will double your battery runtime and also work: [URL]  
Greetings, I am looking for replacement battery for my XPS 15 9560:From the invoice it reads:451-BBXZ 56WHr, 3-cell Lithium Ion Battery Any recommended replacement parts/sources ? Thanks,
XPS 15 9560 replacement battery