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Rectangular black lithium-polymer laptop battery, 214.90 by 103.00 by 5.65 mm

Cameron & Co

Cameron & Co DS-CS-DEL520NB 11.4V 3.35Ah laptop battery

SKU CH-Z75W-55K07

11.4 V, 3.35 Ah lithium-polymer replacement battery for Dell Latitude 5420 and 5520 models

  • TypeBattery
  • Compatible with Dell Latitude 5420 and 5520 models
  • 4 V 3.35 Ah lithium-polymer cell chemistry
  • 19 Wh capacity for extended mobile use
  • Slim 5.65 mm profile fits original chassis
  • Replaces Dell part numbers WY9DX and 005R42

What this battery replaces

The Cameron & Co DS-CS-DEL520NB is a new 11.4V 3.35Ah lithium-polymer pack built for Dell Latitude 5420 and 5520 notebooks. It matches the original WY9DX and 005R42 part numbers and delivers 38.19Wh of capacity in a black 214.90 x 103.00 x 5.65mm form factor.

Who should buy this and who should not

Dell owners needing a direct replacement for a worn or failed WY9DX or 005R42 cell will find this unit fits and charges without modification. Buyers whose laptop requires a different voltage, connector layout or physical footprint should look at another part because this pack only suits the listed Latitude models.

The specification that decides fit

The 11.4V 3350mAh rating combined with the exact 214.90 x 103.00 x 5.65mm dimensions determines whether the battery seats correctly and reports the proper charge level to the system firmware.

Highlights

  • Compatible with Dell Latitude 5420 and 5520 models
  • 4 V 3.35 Ah lithium-polymer cell chemistry
  • 19 Wh capacity for extended mobile use
  • Slim 5.65 mm profile fits original chassis
  • Replaces Dell part numbers WY9DX and 005R42

Specifications

BrandCameron Sino
ModelDS-CS-DEL520NB
TypeBattery

Questions about this item

How many charge cycles can the DS-CS-DEL520NB 3.35 Ah Li-Polymer pack sustain before it needs replacement?

The 11.4 V 3350 mAh cell is rated for several hundred full cycles under normal use; capacity will gradually decline until a replacement is required.

What limits continuous runtime when the Latitude 5420 or 5520 draws maximum load from this 38.19 Wh battery?

The 3.35 Ah capacity and internal cell resistance set the practical ceiling; heavy workloads drain the pack faster than light tasks.

Does the 5.65 mm thick DS-CS-DEL520NB run hot or make noise during all-day operation in a Dell Latitude?

Li-Polymer chemistry produces no audible noise; warmth stays low under typical office loads and rises only during sustained high-current draw.

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