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Rectangular black lithium-ion laptop battery with six cells and connector pins

PISKEKAT

PISKEKAT T54FJ 8858X 65Wh 11.1V 6-cell laptop battery

SKU CH-KFZZ-KHQRT

65 Wh, 11.1 V lithium-ion replacement battery fits Dell Latitude, Precision and Inspiron laptops

  • Battery TypeLaptop Batteries
  • 65 Wh capacity delivers extended runtime for compatible Dell laptops
  • 1 V lithium-ion chemistry matches original voltage specifications
  • Six-cell design fits Latitude E6420 E6430 E6440 E6520 E6530 E6540 series
  • Replaces multiple Dell part numbers including 8858X N3X1D 71R31 T54FJ
  • Compatible with Inspiron 14R 15R 17R and Precision M2800 models

What this battery replaces

The PISKEKAT T54FJ 8858X is a new 65 Wh lithium-ion pack rated at 11.1 V with six cells. It matches Dell part numbers such as 8858X, N3X1D, 71R31, T54FJ and 312-1163. It fits Latitude E6420, E6430, E6440, E6520, E6530, E6540, E5420, E5430, E5520, E5530, Precision M2800 and Inspiron 14R, 15R and 17R series models.

Thermals and power behaviour

The 65 Wh capacity at 11.1 V delivers the same energy budget the original Dell packs provided for these systems. Li-ion chemistry keeps self-discharge low during storage and does not add audible noise. Normal charging and discharging cycles stay within the thermal envelope designed for the listed Latitude, Precision and Inspiron chassis.

Build and daily fit

The six-cell layout follows the original form factor so the battery seats in the standard bay without adapters or case modification. Matching the extensive Dell part-number list — including 312-1242, 312-1310, 312-1311, 451-11947 and 8P3YX — means the latch and connector align with factory mounting points. Buyers needing a higher-capacity pack or a different voltage will not be served by this unit.

Highlights

  • 65 Wh capacity delivers extended runtime for compatible Dell laptops
  • 1 V lithium-ion chemistry matches original voltage specifications
  • Six-cell design fits Latitude E6420 E6430 E6440 E6520 E6530 E6540 series
  • Replaces multiple Dell part numbers including 8858X N3X1D 71R31 T54FJ
  • Compatible with Inspiron 14R 15R 17R and Precision M2800 models

Specifications

Battery TypeLaptop Batteries

Questions about this item

How do I install the 6-cell 11.1V battery in my Dell Latitude E6420, and what step is often missed?

Slide the battery into the bottom bay until the latch clicks, then press the release latch once more to confirm it is fully locked; many users stop at the first click and the pack sits loose.

What maintenance or replacement will the Li-ion 65Wh pack need later?

The cells lose capacity with each charge cycle; when runtime becomes too short for your work, replace the whole 6-cell unit — there are no user-serviceable parts inside.

What limit appears first during sustained heavy use of this 11.1V 65Wh battery?

The pack hits its thermal ceiling before the 65 watt-hour rating is exhausted, causing the laptop to throttle performance to protect the cells.

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