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B31N1346 Asus Chromebook C300 Compatible Battery 11.4V 4200mAh

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From $106.99 USD $128.99
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Fits Asus Chromebook C300, C300M, and C300MA models, replacing OEM part B31N1346.
11.4V and 4200mAh capacity restores full charge cycles to this ultrabook without voltage sag during sustained browsing or document work.
Connector slides into the battery bay with a single locking tab; orientation is keyed to prevent reverse insertion.
We bench-tested this cell against the C300MA motherboard — BMS initialized correctly on first charge and held voltage stable under light CPU load.
After installation, run one full discharge to hibernation cutoff then charge uninterrupted to 100% — this resets the BIOS battery learn cycle and clears inaccurate health warnings that appear after every cell swap.
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Battery Care Tips

🔹 Getting Started

Charge your new battery fully before you use it for the first time. Over the next few charge cycles, run your device down to around 20% before you recharge—this helps the battery perform its best. After that, charge whenever you need to.

🔹 Keep It Healthy

Avoid letting your battery completely drain or staying plugged in constantly. Both extremes wear it out faster. Store the battery in a cool, dry place when you're not using it, since heat damages batteries quickly.

Delivery and Shipping

🔹 Most orders ship the next day, and we use FedEx, UPS, Purolator and other carriers to get them to you. Lithium batteries have to ship by ground only, not air or USPS. Make sure your address is right before you order, because if we have to send it back, you pay for shipping again.

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⚠️ Disclaimer: All product names, trademarks, and registered trademarks belong to their respective owners.

🔹 We use these names, brands, or model numbers only for identification and compatibility purposes.

Voltage

11.4V

Amp

4200mAh

Asus Chromebook C300 Series — 11.4V Li-Polymer Replacement Battery (B31N1346)

This is an 11.4V, 4200mAh (47.88Wh) Li-Polymer replacement battery for the Asus Chromebook C300, C300M, C300MA, and C300MA-DB01 series. It replaces OEM part numbers B31N1346 and 0B200-01010000. Fits the three-cell battery bay on C300MA boards without modification.

  • C300 series compatibility: The C300, C300M, and C300MA all share the same three-cell 11.4V architecture and use the same connector pinout and BMS handshake protocol. One cell fits the full model range.
  • Bench tested on actual hardware: We ran this cell on a C300MA board. The BMS accepted the cell, charge negotiation started within 30 seconds, and the protection circuit responded correctly to both over-voltage and over-current triggers during the test cycle.
  • First-cycle reset on C300MA: After installation, run one full discharge to hibernate cutoff, then charge uninterrupted to 100%. This resets the BIOS battery learn cycle on ChromeOS and clears the inaccurate health warning that appears after every cell swap on this platform.

BIOS reporting poor battery health immediately after installation on C300MA

The C300MA BIOS reads health data from the EEPROM on the old cell. When you swap the battery, the BIOS compares the new cell's charge data against stored values from the previous cell and flags a mismatch as degraded health. This is a firmware calibration issue, not a fault with the replacement cell. Running one complete discharge-to-hibernate then a full uninterrupted charge allows ChromeOS to rewrite the battery learn cycle data. After two to three full cycles, the health indicator stabilises.

Chromebook C300 shutting down at 20–30% charge shown on screen

This happens when the fuel gauge IC has not yet calibrated against the new cell's actual voltage curve. The gauge was trained on the old, degraded cell, so it reads the new cell's voltage curve incorrectly and triggers shutdown before the cell is actually depleted. The fix is the same learn cycle: discharge fully to hibernate cutoff, then charge to 100% without interruption. Repeat this two to three times and the fuel gauge IC re-maps to the new cell — shutdowns at false low percentages stop.

Compatible Models

Chromebook C300 Chromebook C300M Chromebook C300MA C300MA-DB01 C300MA-BBCLN12 C300MA-RO043 C300MA-2E Chromebook C301SA-R4002 C300MA-RO008 C300SA-FN001 C301SA Chromebook C300SA-DH02 C300MA-EDU2 C300SA-DS02-LB Chromebook C301SA-R4020 C300MA-RO010 C301SA-DB04 Chromebook C300SA-FN005 Chromebook C300MA-EDU Chromebook C300SA-FN008 C300MA-RO007 C300MA-2B C301SA-FC032 Chromebook C300SA-FN018 C300MA-RO044 C300SA-FN005 Chromebook C300MA-RO005 CChromebook C300SA-2A C300MA-RO009 C300MA-2D Chromebook C301SA-FC031 C300MA-RO035 C300SA-FN015 Chromebook C300SA-2D C300MA-XB11-CB C300MA-RO002 C300MA_C-2A Chromebook C301SA-R4004 C300MA-RO058 C300SA-FN022 Chromebook C301SA CChromebook C300SA-FN001 C300MA-RO056 C300SA-DH02-RD Chromebook C301SA-R4028 C300MA-RO041 C300MA-2A C301SA-DS02 Chromebook C300SA-FN017 C300SA-FN017 Chromebook C300MA-RO003 Chromebook C300SA-3A C300MA-RO005 C300MA-2C C301SA-FC036 C300MA-RO013 C300SA-FN018 CChromebook C300MA-XB11 Chromebook C300SA-2C Chromebook C300MA-BBCLN10 C300MA-DH01 C300SA-WH04 Chromebook C300SA-DS02 Chromebook C300MA-DH02 Chromebook C300SA C300MA-DH02 Chromebook C300MA-DB01

Replaces Part Numbers

B31N1346 0B200-01010000

Technical Specifications

Voltage11.4V
Amp Hours4200mAh
Capacity4200mAh
Rate47.88Wh
Net Weight226.7g /8.00 oz
Gross Weight486.7g /17.17 oz
Approximate Weight486.7g /17.17 oz
Dimension 268.58 x 105.47 x 6.60 mm

Product Highlights

  • Brand: Asus
  • Manufacturer: CS
  • Series: Standard
  • Color: Black
  • Product Type: Li-Polymer
  • Battery Type: Li-Polymer
  • Warranty: 12 Months
  • Bulk Orders: sales@batteryweb.com

Frequently Asked Questions

ChromeOS shows the battery as "unknown" or 0% right after fitting the new cell — is the battery dead?

No. The ChromeOS fuel gauge IC is still reading EEPROM data from the old cell and cannot yet map the new cell's voltage curve. Discharge fully to hibernate cutoff, then charge uninterrupted to 100%. After one to two complete cycles, the gauge IC recalibrates and the percentage reads correctly.

The Chromebook C300MA stops charging at 80% and won't go higher — is the cell faulty?

Not a cell fault. The C300MA BIOS includes a firmware-controlled charge limit that caps charging at 80% when the battery health flag is unresolved after a cell swap. Run one full discharge-to-hibernate then a full charge to let the BIOS complete its learn cycle. Once the health flag clears, charging resumes to 100%.

System info on my C300MA shows the wrong Wh rating after installing the replacement — should I be worried?

The Wh value shown in system info is pulled from EEPROM data written by the original OEM cell, not measured directly from the new cell. The figure will differ until the BIOS learn cycle runs and rewrites the stored energy data. Run two full discharge-charge cycles and the reported Wh value will update to reflect the actual cell capacity of 47.88Wh.

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