Asus VivoBook Flip 14 C21N1714 Replacement Battery 7.7V
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Asus VivoBook Flip 14 C21N1714 Replacement Battery 7.7V - is backordered and will ship as soon as it is back in stock.
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Battery Care Tips
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
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
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🔹 We use these names, brands, or model numbers only for identification and compatibility purposes.
Asus VivoBook Flip 14 C21N1714 Replacement Battery 7.7V - is backordered and will ship as soon as it is back in stock.
Voltage
7.7V
Amp
5000mAh
Asus VivoBook Flip 14 TP401CA Series — 7.7V Li-Polymer Replacement Battery (C21N1714)
This 7.7V, 5000mAh (38.5Wh) lithium-polymer cell replaces the internal battery in the Asus VivoBook Flip 14 TP401CA-EC012T, TP401NA-EC007T, TP401MA-BZ031TS, TP401NA-BZ002T, and over 100 additional TP401 variants. It matches the OEM C21N1714 and 0B200-02740000 part numbers. The slim 5.56mm profile fits the TP401's low-clearance chassis without modification.
- TP401 platform compatibility: All TP401CA, TP401NA, and TP401MA models share the same 7.7V two-cell architecture, connector pinout, and BMS communication protocol — which is why a single C21N1714 cell spans the entire TP401 convertible line.
- Bench tested on actual hardware: We ran this cell on a TP401CA unit and confirmed the BMS handshake completed within two charge cycles — voltage stepped up cleanly from rest through CV phase with no cutoff interruptions.
- Post-install discharge cycle on the TP401: After fitting, run the laptop on battery only until it hibernates at the BIOS low-voltage cutoff, then charge uninterrupted to 100%. The TP401's fuel gauge IC needs this full sweep to calibrate against the new cell — skipping it leaves the OS reporting inaccurate charge percentages for weeks.
BIOS reporting poor battery health immediately after fitting the C21N1714
The TP401's BIOS reads health data from EEPROM registers written by the original cell over its lifetime. A new cell arrives with factory EEPROM values that don't match the wear history the BIOS expects, so it flags the battery as degraded before it's seen a single charge cycle. This is a data mismatch, not a cell fault. Run one full discharge-to-hibernate then a full uninterrupted charge — most TP401 units clear the warning after one to three cycles as the BMS rewrites the health registers. If the warning persists beyond three cycles, check BIOS version and update to the latest Asus firmware for the TP401 platform.
VivoBook Flip 14 shutting down at 20–30% charge shown on screen
This happens when the cell voltage drops below the BMS cutoff threshold under full load before the fuel gauge reaches zero — the display, processor, and convertible hinge sensors all draw simultaneously when the unit is in tablet or tent mode. The OS percentage you see is calculated from the previous cell's discharge curve, which no longer matches the new cell. The fuel gauge IC needs two to three full discharge-charge cycles to relearn the actual voltage-to-capacity curve of the replacement cell. Let the laptop discharge fully to hibernate cutoff at least twice, then charge to 100% each time, and the 20–30% shutdown will stop as the gauge aligns to 7.7V chemistry.
Compatible Models
Replaces Part Numbers
Technical Specifications
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
My TP401 BIOS shows the new battery Wh rating as lower than the 38.5Wh printed on the cell — is something wrong with the replacement?
The BIOS pulls the Wh figure from an EEPROM register on the battery's BMS controller, and that register is pre-loaded with rated chemistry data that can differ slightly from the actual measured capacity of a fresh cell. This is an EEPROM reporting difference, not a capacity defect. Run two full discharge-to-hibernate and charge-to-100% cycles — the BMS recalculates and rewrites the Wh register against real measured data, and the BIOS figure corrects itself. After the second cycle, the displayed value should sit at or very close to 38.5Wh.
The fuel gauge on my VivoBook Flip 14 jumps from 60% straight to 35% — why is it so inaccurate after the battery swap?
The fuel gauge IC on the TP401 learns discharge curves from the cell it was calibrated against — when you swap to a new C21N1714, the IC is still reading against the old cell's curve, so voltage drop points don't match percentage readouts. The jumps are real voltage steps on the new cell hitting old calibration thresholds. Force three full cycles: discharge to hibernate cutoff each time, then charge uninterrupted to 100%. After the third cycle the fuel gauge IC will have enough data points on the new cell to report accurately within a few percent.
The replacement C21N1714 won't charge past 80% — is the battery faulty or is this a setting?
Asus BIOS on several TP401 variants ships with a charge limit feature — sometimes called "Battery Health Charging" — that caps charging at 80% to reduce long-term cell stress when the laptop runs on AC most of the time. This is firmware-controlled and has nothing to do with the replacement cell. Go into MyAsus or the BIOS power settings, find Battery Health Charging, and switch the mode to Full Capacity. The battery
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