Acer Chromebook Spin 11 CP311-1HN-C3E3 Compatible Battery AP19A8K 11.55V
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Acer Chromebook Spin 11 CP311-1HN-C3E3 Compatible Battery AP19A8K 11.55V - 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
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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 Spin 11 CP311-1HN-C3E3 Compatible Battery AP19A8K 11.55V - is backordered and will ship as soon as it is back in stock.
Voltage
11.55V
Amp
3450mAh
Acer Chromebook Spin 11 CP311-1HN-C3E3 — 11.55V Li-Polymer Replacement Battery (AP19A8K)
This is an 11.55V, 3450mAh (39.85Wh) Li-Polymer battery cell for the Acer Chromebook Spin 11 and CP311 series convertibles. It replaces part number AP19A8K — the original internal cell that powers these 11-inch 2-in-1 Chromebooks. When the original cell degrades and the device can no longer hold a usable charge, this swap restores unplugged operation.
- CP311 series compatibility: The CP311-1HN, CP311-2HN, CP311-3H, and related variants share the same AP19A8K cell format, voltage rail, and BMS connector. The battery management handshake is identical across the lineup, so one part number covers all listed models.
- Bench tested on actual hardware: We cycled this cell on CP311 hardware and confirmed the BMS completed full charge termination at 11.55V, with no false low-voltage cutoffs and accurate state-of-charge signalling to ChromeOS from the first cycle.
- Post-swap calibration on the CP311: After installing, run the Chromebook down to automatic hibernate-cutoff, then charge uninterrupted to 100% without using the device. This resets the fuel gauge IC's learn cycle and clears the inaccurate battery health warning that ChromeOS displays after every cell replacement.
ChromeOS reporting poor battery health immediately after AP19A8K swap
The Acer EC firmware reads EEPROM data from the outgoing cell and stores a health baseline. When a new cell goes in, the EC compares current readings against that stale baseline and flags health as poor or degraded before the new cell has run a single cycle. This is a firmware artefact, not a sign of a faulty replacement. Running one full discharge-to-hibernate followed by an uninterrupted charge to 100% forces the EC to rewrite the health register against the new cell's actual capacity curve. After that cycle, the health indicator resets to normal.
CP311 shutting down at 20–30% charge shown on screen
This happens when the cell voltage drops below the BMS cutoff threshold under combined CPU and display load, even though the fuel gauge still reads 20–30%. The fuel gauge IC has not yet mapped the new cell's voltage-to-capacity curve accurately — it is extrapolating from old data. The cell hits a voltage cliff under load before the gauge catches up. Run two or three full discharge-to-hibernate and full charge cycles; the fuel gauge IC recalibrates its curve against the new cell, and the premature shutdown stops. Confirm the gauge is reading correctly when resting voltage at 30% shown stays above 10.8V.
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 shows battery at 0% or "unknown" right after I put the new AP19A8K in — is the cell dead?
It is not dead. The Acer EC firmware is reading stale EEPROM data from the old cell and has not yet mapped the new cell's capacity. Run the Chromebook down to hibernate-cutoff on battery, then charge uninterrupted to 100%. That single learn cycle rewrites the EC's battery register and clears the 0% or unknown reading.
The fuel gauge jumps around wildly for the first few charges — showing 60%, then 90%, then 45% within minutes. What is happening?
The fuel gauge IC on the CP311 mainboard calibrates itself against each individual cell's charge curve. A new cell has a different curve than the worn-out cell it replaced, so the gauge reads inaccurately until it builds a new internal map. This settles after two to three full discharge-to-hibernate and full charge cycles. Do not rely on the percentage reading until those calibration cycles are complete.
System info shows the battery Wh rating as lower than the 39.85Wh on the product listing — is something wrong?
Nothing is wrong with the cell. The Wh figure ChromeOS displays is pulled from the EEPROM of the original factory cell, not measured live from the new one. The mismatch is a data artefact — the EC has not yet overwritten the stored rating. After completing a full discharge-to-hibernate cycle followed by a full charge, the EC recalculates from actual cell data and the reported Wh figure updates to reflect the installed cell.
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