Battery PRI, 70WHR, 6C, LITH,

Dell 7T7DY is a primary lithium battery for powering a compatible Dell laptop when it is away from a mains connection. The exact part reference is 7T7DY, so the model is clearly identified for replacement or service use.

Its six-cell configuration provides a stated 70 Wh energy capacity. This gives the battery a substantial stored-energy reserve for portable use; actual runtime depends on the laptop and how it is used. The product designation also names BYD.

This is a specific Dell battery part, rather than a generic capacity description. Its confirmed details are the 7T7DY reference, lithium chemistry, six cells and 70 Wh capacity.