The Dell 451-12135 is a 9-cell lithium-ion replacement battery for compatible Dell notebooks. Its part number is 71R31, and the documented ratings are 11.1 V, 8550 mAh and 97 Wh. These values identify this battery configuration for shoppers comparing a replacement or spare.
It is listed for Dell Latitude E6440, Latitude E6440 ATG, Latitude E6540 and Precision M2800. Check the notebook model against this list when choosing a battery.
The 9-cell design and 97 Wh energy capacity describe the battery’s electrical configuration; they do not specify a particular runtime. It can replace a battery in one of the listed systems or be kept as a spare for them.
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