Acer Chromebook 11.6" AP13J3K Compatible Battery 11.25V 3950mAh
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Acer Chromebook 11.6" AP13J3K Compatible Battery 11.25V 3950mAh - 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.
Acer Chromebook 11.6" AP13J3K Compatible Battery 11.25V 3950mAh - is backordered and will ship as soon as it is back in stock.
Voltage
11.25V
Amp
3950mAh
Acer Chromebook C720 / C720P — 11.25V Li-Polymer Replacement Battery (AP13J3K)
This 11.25V, 3950mAh (44.44Wh) Li-Polymer battery fits the Acer Chromebook C720, C720P, and C720-3404, along with the broader Chromebook 11.6" line. It replaces OEM part numbers AP13J3K, AP13J4K, AP13J7K, KT.00304.001, and several related variants. When the original cell degrades and the Chromebook no longer holds a charge, this is the direct cell swap.
- C720 series compatibility: The C720, C720P, and adjacent 11.6" variants share the same 11.25V three-cell architecture, connector pinout, and BMS handshake protocol — which is why a single AP13J3K cell covers all of them. Swapping between those sub-models does not require a different battery.
- Bench tested on actual hardware: We ran this cell through charge and discharge cycles on a C720P unit. The BMS negotiated correctly, charge termination triggered at full capacity, and the protection circuit responded to over-discharge cutoff at the expected low-voltage threshold without latching fault states.
- Post-swap learn cycle on ChromeOS: After fitting this cell, run the Chromebook down until it hibernates on its own — do not force shutdown. Then charge it uninterrupted to 100%. This gives the fuel gauge IC one complete reference cycle against the new cell chemistry and clears the inaccurate capacity reading ChromeOS logs after every cell replacement.
Why ChromeOS flags poor battery health immediately after a cell swap
The Chromebook's embedded controller reads health data from EEPROM registers that were written by the original factory cell. A new cell resets the physical chemistry but not those stored values, so ChromeOS compares current readings against outdated baseline figures and logs a health warning. This is a data mismatch — not a fault with the replacement cell. Running one complete discharge-to-hibernate then a full uninterrupted charge allows the fuel gauge IC to rewrite its reference data against the new cell. After that cycle, the health warning clears on its own.
Chromebook shutting down at 20–30% charge shown on screen
This happens when the cell voltage drops below what the CPU and display draw can sustain under load — even though the fuel gauge still shows capacity remaining. The gauge is reading average voltage, not instantaneous load voltage, so there's a gap between what it displays and what the cell can actually deliver under full-system draw. It becomes more visible in an aged or deeply discharged cell that hasn't been calibrated. Run the learn cycle described above — one full discharge to hibernate cutoff, then charge to 100% — and confirm the shutdown threshold moves back down toward 5% or lower.
Compatible Models
Replaces Part Numbers
Technical Specifications
Product Highlights
- Brand: Acer
- 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 says "battery is not supported" or shows 0% right after fitting the new cell — is the battery faulty?
No — this is an EEPROM mismatch, not a bad cell. The embedded controller is comparing the new cell's data against values written by the original factory battery, and they don't match. Run the Chromebook down until it hibernates on its own, then charge it uninterrupted to 100%. That one calibration cycle rewrites the reference data and clears the warning.
The battery percentage jumps around wildly for the first day or two — reads 60%, then suddenly 85%, then drops to 40%
The fuel gauge IC on the C720 needs a few full reference cycles to map the new cell's discharge curve. Until it has that data, it interpolates from the old cell's profile, which causes erratic readings. Run two or three complete discharge-to-hibernate then full-charge cycles back to back. After the third cycle, the gauge stabilises and tracks the actual cell state within a few percent.
The replacement cell charges to 100% but the system info screen shows a lower Wh rating than the original — is the capacity wrong?
The Wh figure displayed in ChromeOS or via crosh pulls from EEPROM-rated data stored on the battery's protection circuit, which may differ slightly from the cell's actual measured capacity. This is a reporting difference between the stored nominal rating and the chemistry of the physical cell — not a capacity shortfall. The cell in this listing is rated at 44.44Wh (3950mAh at 11.25V). If the figure shown is within a few Wh of that, the cell is performing correctly.
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