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Rectangular black 3-cell lithium-ion battery pack with label showing 42Wh 11.4V

DELL

DELL 42Wh 11.4V 3-Cell Laptop Battery 7CJRC KNM09 21X15 TX283

SKU CH-ZBY9-7VZDW

11.4 V 42 Wh lithium-ion 3-cell replacement battery fits Dell 7CJRC KNM09 21X15 TX283 models

  • Battery typeLithium-Ion
  • Compatible withCompatible with Dell 7CJRC KNM09 0KNM09 21 × 15 021 × 15 TX2
  • 42Wh capacity extends runtime between charges
  • 4V lithium-ion chemistry matches original specification
  • 3-cell design fits compatible Dell models precisely
  • CE and RoHS certified for safety compliance
  • One-year replacement warranty covers manufacturing defects

Direct Replacement for 42Wh Dell Packs

This 42Wh lithium-ion battery replaces Dell part numbers 7CJRC, KNM09, 0KNM09, 21X15, 021X15, TX283 and 0TX283. It delivers 11.4V from three premium cells and carries CE and RoHS certification. The pack is sold new with a one-year replacement warranty.

Owners of Matching Dell Notebooks

The unit fits only the specific Dell models listed in the compatibility data; there are two different batteries for the same laptop series and they are not interchangeable. Buyers who cannot verify their original part number against the photos should look at a different pack.

Simple Swap with Visual Verification

Installation is a standard battery swap once the correct part is confirmed. The main risk is ordering the wrong variant for the laptop model, so comparing the original battery to the product photos before purchase avoids a mismatch.

How it compares

Measured against everything we stock in Laptop Chargers & Batteries, at today’s prices. Recalculated every night.

Price $34.99
Pricier than about 62% of the 27,790 comparable items (median $30.99).

Specifications

Power
Battery typeLithium-Ion
Compatibility
Compatible withCompatible with Dell 7CJRC KNM09 0KNM09 21 × 15 021 × 15 TX283 0TX283

Questions about this item

Which Dell battery part numbers must match the 7CJRC KNM09 21X15 TX283 for this 42Wh 11.4V 3-cell unit to work?

This battery is compatible with Dell part numbers 7CJRC, KNM09, 0KNM09, 21X15, 021X15, TX283 and 0TX283.

Will this 11.4V lithium-ion replacement work in a Dell notebook that originally used a lower-voltage 3-cell battery?

The replacement is rated at 11.4V and 42Wh; it only fits models designed for that voltage, so verify the original battery label before installing.

After fitting the 42Wh 3-cell pack, what indicates the battery is operating correctly?

The laptop should recognise the new pack, charge to 100 % and deliver run-time consistent with a 42Wh 11.4V lithium-ion cell.

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