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Black rectangular lithium-ion laptop battery, model B21N1329

PISKEKAT

PISKEKAT B21N1329 laptop battery 7.6V 30Wh Asus X403 X503M

SKU CH-R17K-75WD2

Replacement 7.6V 30Wh Li-ion battery fits Asus X403, X503M and related models, tested for circuit protection and 500 recharge cycles

  • Battery TypeLaptop Batteries
  • 6 V output matches original spec for stable power
  • 30 Wh capacity restores full runtime on compatible Asus models
  • Li-ion chemistry with low self-discharge holds charge during storage
  • Built-in circuit protection guards against overcharge and short circuits
  • Rated for about 500 recharge cycles over service life

Compatible Asus models

This replacement battery fits Asus X403 X403M X403MA X503M X502CA X453 X453MA X553 X553M F453 F453MA F553M S400 and P553 laptops. It matches part numbers B21N1329 and 0B200-00840000 for direct installation. Buyers with other Asus series or different part numbers cannot use this unit.

Electrical specification and cycle life

The lithium-ion cell delivers 7.6V and 30Wh capacity with a rated lifespan of about 500 recharge cycles. Built-in circuit protection guards against over-voltage, over-current and short-circuit conditions. Low self-discharge helps the pack retain charge during storage periods.

Safety certifications and daily handling

Each unit is tested for correct voltage, stable current and low self-discharge and carries CE FCC and RoHS safety certifications. The black housing uses the original connector layout so it slots into the battery bay without adapters. No tools beyond a standard screwdriver are required for the swap.

Highlights

  • 6 V output matches original spec for stable power
  • 30 Wh capacity restores full runtime on compatible Asus models
  • Li-ion chemistry with low self-discharge holds charge during storage
  • Built-in circuit protection guards against overcharge and short circuits
  • Rated for about 500 recharge cycles over service life

Specifications

Battery TypeLaptop Batteries

Questions about this item

After roughly 500 recharge cycles, will the B21N1329 need replacement?

The cell is rated for about 500 full cycles before capacity drops noticeably; daily charging means a swap in one to two years.

What is the first limit reached during a long work session on this 30 Wh pack?

The 30 Wh capacity sets the runtime ceiling; sustained loads will drain it in a few hours before any thermal throttle appears.

Does the 7.6 V Li-ion unit generate extra heat or fan noise when the laptop runs all day?

The battery itself produces negligible heat and no noise; any warmth or fan activity comes from the notebook, not the pack.

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