Product reference : #BLD-75765
Battery laptop dell inspiron 17 7778
Chemistry : Lithium-Ion
Capacity : 3400 mAh
Voltage : 15.2 V
Color : Noir
Series : dell inspiron
Subseries : inspiron-17
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For all battery the difference of 2 volts in the voltage is negligible. The compatibility with your old Battery laptop dell inspiron 17 7778 is therefore ensured.