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Rectangular black laptop battery with connector strip

NShi

NShi C21N1818-1 laptop battery 7.7V 4850mAh 37Wh 4-cell for ASUS Vivobook 15 F512 R564 A512 K512 S51D

SKU CH-VD1N-KARDN

Replacement 7.7 V 4850 mAh lithium-ion pack fits ASUS Vivobook 15 F512, R564, A512, K512 and S512 models

  • Battery type4 Cell Lithium-Ion
  • Battery voltage rating7.7 V
  • Battery capacity4850MAH
  • Product colorBlack
  • Product typeBattery
  • Compatible withASUS VIVOBOOK 15 F512DA, 15 F512FA, 15 F512FB, 15 F512FJ, 15
  • Replaces OEM part C21N1818-1 for direct fit
  • 37Wh capacity powers extended work sessions
  • 4-cell lithium-ion design balances weight and runtime
  • Tested for stable voltage and circuit protection
  • CE, FCC and RoHS certified for safety

Replacement for Vivobook 15 series

This 7.7V 4850mAh lithium-ion pack replaces the original C21N1818-1 unit in numerous Vivobook 15, R564, A512, K512 and S512 models. It restores mobile power for owners whose factory battery no longer holds a useful charge. The four-cell design matches the OEM form factor so the laptop chassis closes normally.

Capacity and voltage limits

Rated at 37Wh, the pack delivers the same voltage and capacity the notebook expects, so runtime mirrors the original specification. It cannot extend running time beyond what the platform was designed for, and it will not fit models outside the listed compatibility range. Users needing longer unplugged sessions must look to higher-capacity alternatives if they exist for their chassis.

Build and daily implications

The black housing uses the original connector layout and mounting points, allowing a direct swap without tools beyond a screwdriver. Integrated circuit protection guards against overcharge, over-discharge and short circuits during normal use. CE, FCC and RoHS markings confirm compliance with baseline safety and environmental standards.

How it compares

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

Price $50.99
Pricier than about 82% of the 27,790 comparable items (median $30.99).

Specifications

Product
Brand nameGreenTech
Model nameC21N1818-1, 0B200-03280800
Part numberC21N1818-1, 0B200-03280800
Product colorBlack
Product typeBattery
Power
Battery type4 Cell Lithium-Ion
Battery voltage rating7.7 V
Battery capacity4850MAH
Compatibility
Compatible withASUS VIVOBOOK 15 F512DA, 15 F512FA, 15 F512FB, 15 F512FJ, 15 F512FL, 15 F512JA, 15 F512JP, 15 F512UA, 15 R564DA, 15 R564FA, 15 R564JA, A512FA, A512FB, A512FL, A512JA, A512JP, A512UA, A512UF, K512FA, S512DK, S512FA, S512FB, S512FL, S512UA

Questions about this item

Should I choose the 4850mAh version or a different capacity for my Vivobook 15?

This battery is offered only as a 4850mAh 4-cell pack rated at 37Wh. There is no alternative capacity listed for the C21N1818-1 part number, so this is the version to select.

What does the 37Wh rating mean for daily runtime on my laptop?

The 37Wh rating indicates the total energy the 7.7V 4850mAh pack can store. Actual runtime depends on your Vivobook model, screen brightness, workload and battery health, but 37Wh is the baseline capacity for the F512, R564, A512, K512 and S512 series.

Does the 7.7V voltage match the original ASUS battery interface?

Yes. The replacement is specified at 7.7V, which matches the OEM C21N1818-1 and 0B200-03280800 batteries used across the listed Vivobook 15 models.

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