The HP 931702-1C1 is a Li-polymer replacement battery for notebooks. Its listed sub-part number, HSTNN-LB8F, identifies this specific variant.
With 3 cells, it is rated at 48 Wh, 4212 mAh and 11.4 V. These figures specify its energy capacity, charge capacity and voltage when selecting a replacement.
The listed matching models include HP ProBook 640 G5 and HP ProBook 645 G4. Use it as a notebook power source only in systems specified as compatible.