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Rectangular black lithium-polymer laptop battery with connector pins

E-buy

E-buy C21N1603 39Wh 7.7V laptop battery for Asus T303 T304

SKU CH-GP18-9GZDM

Replacement 39 Wh, 7.7 V lithium-polymer battery compatible with Asus T303 and T304 models

  • Battery typeLaptop Batteries
  • Product typeBattery
  • Li-polymer chemistry provides stable power delivery
  • 39Wh capacity supports extended mobile use
  • 7V rating matches original Asus specification
  • 5065mAh cell capacity enables longer runtime
  • Compatible with Asus T303 and T304 series

Direct replacement for Asus T303 and T304

The E-buy C21N1603 is a 39Wh 7.7V lithium-polymer battery built to replace the original C21N1603 cell in Asus TransBook T303UA and T304UA models. It restores factory runtime for owners of those specific ultraportables.

Black polymer pack with integrated connector

The black Li-polymer housing matches the OEM form factor and plugs directly into the existing battery bay without adapters or soldering. A simple screw-down installation returns the notebook to mobile use in minutes.

Ready-to-use cell with 5065mAh rating

No extra cables, tools or calibration software are bundled; the pack ships at a safe storage charge so it can be fitted and cycled normally. Buyers needing a higher-capacity alternative or a multi-bay charging dock will not find those options here.

How it compares

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

Price $49.99
Pricier than about 82% of the 27,790 comparable items (median $30.99).

Specifications

Product
Product typeBattery
Power
Battery typeLaptop Batteries

Questions about this item

What voltage does the C21N1603 battery supply to the Asus T303 and T304 series?

The E-buy C21N1603 delivers 7.7V, matching the original specification for the Asus Transbattery former 3 Pro models.

Which screw-hole pattern and connector does this battery use to fit the Linghuan 3Pro chassis?

It is built to the C21N1603 form factor, aligning with the mounting points and ribbon connector on the T303U, T303UA, T304U and T304UA.

What is the correct order for connecting the ribbon cable and securing the screws during installation?

Seat the battery, plug the ribbon cable firmly into the motherboard header first, then fasten the mounting screws to avoid stress on the connector.

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