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Black rectangular laptop battery pack with connector on one end

PISKEKAT

PISKEKAT C21N1818-1 laptop battery 7.7V 37Wh 4850mAh

SKU CH-ZFFY-6SXRX MPN C21N1818-1

Replacement Li-ion battery rated 7.7V 37Wh 4850mAh for ASUS VivoBook 15, X512, R564, S512, K512 and A512 series

  • Battery TypeLaptop Batteries
  • 7 V lithium-ion chemistry delivers 37 Wh capacity for extended unplugged sessions
  • 4 850 mAh rating supports long work periods between charges
  • Direct replacement for ASUS part C21N1818-1 and 0B200-03190800
  • Fits VivoBook 15 F512, X512, R564, S512, K512 and A512 series models
  • New battery includes installation instructions and protective sponge packaging

Replacement battery for ASUS VivoBook 15

This new lithium-ion battery replaces the original C21N1818-1 unit in compatible ASUS VivoBook 15, X512, R564, K512, S512 and A512 series laptops. It restores mobile power for users whose factory pack no longer holds a useful charge. Verify the exact model printed on your old battery before ordering because the similar C21N1818 is not interchangeable. The package includes the battery and an instruction sheet.

Thermals and power in daily use

The 7.7 V 37 Wh cell delivers 4850 mAh of capacity for typical office and web workloads. Lithium-ion chemistry keeps self-discharge low during standby and produces minimal heat under normal loads. No active cooling is required and the pack adds no audible noise to the system. Power draw follows the laptop’s own management firmware without extra configuration.

Fit and installation notes

The battery sits inside the standard bottom compartment secured by the original screws. Installation only needs a compatible screwdriver to remove the back cover. Confirm the physical shape matches the removed unit before fitting. This part does not support models outside the listed VivoBook families or the distinct C21N1818 variant. Buyers needing a different voltage, capacity or form factor must select another product.

Highlights

  • 7 V lithium-ion chemistry delivers 37 Wh capacity for extended unplugged sessions
  • 4 850 mAh rating supports long work periods between charges
  • Direct replacement for ASUS part C21N1818-1 and 0B200-03190800
  • Fits VivoBook 15 F512, X512, R564, S512, K512 and A512 series models
  • New battery includes installation instructions and protective sponge packaging

Specifications

Battery TypeLaptop Batteries

Questions about this item

How do I install the C21N1818-1 battery in my VivoBook 15, and what step do people often miss?

Power off the laptop, remove the bottom screws, open the back cover, disconnect the old battery connector, fit the new 7.7 V 37 Wh pack, reconnect the cable, replace the cover and screws. The step most often missed is disconnecting the old battery before lifting it out.

What maintenance will this 4850 mAh lithium-ion pack need later?

No scheduled maintenance is required. Keep the charge between 20 % and 80 % when possible, avoid leaving it at full or empty for weeks, and store at room temperature to slow capacity loss.

What limit appears first during sustained use of this 37 Wh battery?

The 37 Wh capacity sets the runtime ceiling; under continuous load the pack will reach its discharge limit and the laptop will shut down or throttle before any thermal or voltage threshold is hit.

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