The Dell K7JTR is an internal replacement battery for notebook use. The distributor lists this part number as a sub-part number for Dell battery 07CXN6.
Its four-cell Li-Polymer design is rated at 6500 mAh and 52 Wh, with a 7.6 V output. These specifications help identify the battery when checking a replacement.
Listed compatible systems include Dell Latitude 14 (7410), Latitude 13 (7310), Latitude 13 2in1 (7310) and Latitude 14 2in1 (7410).