Acer Chromebook 13 CB5-311 Replacement Battery AC14B18J 11.4V
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Acer Chromebook 13 CB5-311 Replacement Battery AC14B18J 11.4V - 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 13 CB5-311 Replacement Battery AC14B18J 11.4V - is backordered and will ship as soon as it is back in stock.
Voltage
11.4V
Amp
3000mAh
Acer Chromebook 13 CB5-311 / Aspire E3 / V3 — 11.4V Li-Polymer Replacement Battery (AC14B18J)
This is an 11.4V, 3000mAh (34.2Wh) Li-Polymer battery for the Acer Chromebook 13 CB5-311, Aspire E3-111, Aspire V3, and related models using the AC14B18J cell. It replaces the original pack when the existing cell no longer holds a usable charge. OEM part numbers covered include AC14B18J, KT.0040G.004, KT0030G.004, and AC14B13J.
- CB5-311, Aspire E3, and V3 platform fit: These models share the same 11.4V three-cell Li-Polymer architecture, connector pinout, and BMS handshake protocol — which is why one pack covers all of them. The charge controller expects the same EEPROM signature across the range.
- Bench tested on actual hardware: We cycled this pack on a CB5-311 unit. The BMS accepted the cell without fault codes, charge acceptance was normal from first plug-in, and the protection circuit tripped correctly at the low-voltage cutoff threshold during discharge testing.
- Post-install calibration on ChromeOS: After fitting, run one full discharge to hibernate cutoff, then charge uninterrupted to 100%. ChromeOS reads fuel gauge data from the cell's EEPROM — skipping this step leaves the health indicator stuck on stale data from the old pack, showing inaccurate capacity warnings for weeks.
Why the CB5-311 shuts down at 20–30% after a battery swap
ChromeOS tracks discharge curves against stored cell data. When a new cell goes in, the fuel gauge IC hasn't mapped the new chemistry's voltage slope yet. The system sees the voltage drop off sharply under CPU-plus-display load and interprets it as a depleted cell — triggering shutdown well above the real empty threshold. Two to three full calibration cycles clear this. After each full discharge-to-hibernate and uninterrupted full charge, the fuel gauge tightens its model of the new cell's curve and the early shutdowns stop.
ChromeOS reporting battery health as "Poor" or 0% on a brand-new cell
This happens because ChromeOS pulls health status from EEPROM data written to the battery controller — not from a live capacity measurement. The old cell's degraded charge cycle count and health flag persist until the learn cycle overwrites them. It is not a fault with the replacement cell. Do a full discharge to hibernate cutoff, charge to 100% without interruption, and check the battery status page at chrome://system — the health figure updates after that first complete cycle.
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
My CB5-311 shows the wrong Wh rating in chrome://system after fitting the new battery — is the cell faulty?
The Wh figure in chrome://system is read from the battery's EEPROM, which stores the rated capacity from the cell manufacturer. If the EEPROM value differs slightly from the label spec, it shows up as a mismatch in system info. The cell itself is not faulty — this is an EEPROM-rated versus actual chemistry difference. Run one full discharge-to-hibernate cycle followed by a full charge, then recheck chrome://system; the reported value stabilises after the fuel gauge IC completes its first calibration pass.
The CB5-311 fuel gauge jumps around — shows 60%, then 45%, then 70% within minutes of unplugging. What's wrong?
The fuel gauge IC calibrates its discharge model against the new cell over the first few cycles. Until that model is built, it interpolates voltage readings against stale data from the old cell, causing erratic percentage jumps. This is not a wiring or contact issue. Run two to three full discharge-to-hibernate cycles with uninterrupted charges to 100% between each — by the third cycle the gauge readings should track smoothly and hold within a few percent of actual state of charge.
New battery installed but charge stops at 80% and never goes higher on the Aspire E3 — is the charger the problem?
The charger is not the problem. Acer's BIOS on the Aspire E3 and CB5-311 series includes a firmware-controlled charge limit that caps charging at 80% when a battery care or eco-charge mode is active. Open the Acer Care Center application, navigate to Battery Health, and check whether the charge limit feature is toggled on. Turning it off allows the battery to charge to 100% — the replacement cell itself has no internal restriction at that threshold.
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