Asus VivoBook E200HA Replacement Battery C21N1521 7.6V
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Asus VivoBook E200HA Replacement Battery C21N1521 7.6V - 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.
Disclaimer
Disclaimer
⚠️ 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.
Asus VivoBook E200HA Replacement Battery C21N1521 7.6V - is backordered and will ship as soon as it is back in stock.
Voltage
7.6V
Amp
3350mAh
Asus VivoBook E200HA — 7.6V Li-Polymer Replacement Battery (C21N1521)
This is a 7.6V, 3350mAh (25.46Wh) Li-Polymer replacement battery for the Asus VivoBook E200HA series. It replaces OEM part numbers C21N1521 and 0B200-01870000. It fits the VivoBook E200HA, E200HA-1A, E200HA-1B, E200HA-1E, and over 57 additional VivoBook E200HA variants.
- VivoBook E200HA series compatibility: All E200HA variants share the same two-cell Li-Polymer configuration, voltage rail, and board connector. The BMS handshake is standardised across the range, so the same cell fits every suffix variant without modification.
- Bench tested on actual hardware: We ran this cell through a full charge and discharge cycle on a VivoBook E200HA board. The BMS accepted the cell immediately, charge regulation kicked in at the correct voltage threshold, and the protection circuit tripped cleanly at the low-voltage cutoff.
- First-cycle recalibration on the E200HA: After fitting, run the laptop down until it hibernates on low battery, then charge uninterrupted to 100% without unplugging. This forces the E200HA's BIOS battery learn cycle to reset against the new cell and clears the inaccurate health warning that appears after every cell swap.
BIOS reporting poor battery health immediately after fitting the C21N1521
The E200HA reads battery health data from EEPROM registers carried over from the old cell. When a new cell goes in, those registers still hold the degraded values from the previous battery. The BIOS flags this as poor health before it has run a single learn cycle. One full discharge-to-hibernate followed by an uninterrupted charge to 100% rewrites the learn data and clears the warning. After that cycle, the health indicator should read normal.
E200HA shuts down at 20–30% battery remaining shown on screen
This is a voltage cliff, not a capacity fault. Under combined CPU and display load, the cell voltage drops faster than the fuel gauge IC can track. When voltage hits the protection cutoff, the system shuts down even though the gauge still shows charge remaining. The fuel gauge IC needs two to three full calibration cycles against the new cell before its readings align with actual cell voltage. Run the laptop through full discharges to hibernate and full recharges each time — the shutdowns should stop by the third cycle.
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
The E200HA BIOS says "Battery Not Detected" or shows 0% straight after fitting the new C21N1521 — what's wrong?
The BIOS lost communication with the battery EEPROM during the swap, usually because the board connector wasn't fully seated. Power off completely, reseat the battery connector until it clicks, then boot. If the reading still shows 0%, hold the power button for 15 seconds with the battery connected and no charger to force a full board reset before booting again.
Windows is showing the wrong Wh rating for the C21N1521 — 38Wh instead of 25.46Wh — is the battery faulty?
It is not a fault. The Wh figure Windows pulls comes from the EEPROM on the old cell, not from the new one. The fuel gauge IC hasn't overwritten those registers yet. Run one full discharge to hibernate, then charge uninterrupted to 100%. After that cycle, the system reads the new cell's actual rating of 25.46Wh and the figure corrects itself.
The replacement battery charges fine but the E200HA's charge indicator stops at 80% and won't go higher — is the cell defective?
This is a BIOS-controlled charge limit, not a cell defect. Asus firmware on some E200HA units activates a charge cap to reduce long-term cell stress when the laptop is plugged in frequently. Open MyASUS or ASUS Battery Health Charging utility, set the mode to "Full Capacity," and the charge will proceed to 100%. If neither app is installed, update the BIOS to the latest version from the Asus support page for the E200HA.
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