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Acer Aspire 3 A315-21 Replacement Battery 7.7V 4750mAh

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Fits Acer Aspire 3 A315-21 laptop; replaces AP16M5J, KT.00205.004, KT.00205.005 battery packs.
7.7V, 4750mAh lithium-polymer cell delivers 36.58Wh to sustain full CPU and display load unplugged.
Connector slides straight into the battery slot with a single locking tab that clips down flush.
We bench-tested this cell against a factory pack — BMS accepted the new pack on first insertion with no fault delay.
After installation, discharge fully to system hibernate, then charge uninterrupted to 100% to reset the BIOS battery learn cycle and clear health warnings.
Delivery time

This product ships directly from our Manufacturer's Warehouse and is usually delivered within 7 – 10 business days to your doorstep.

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Fresh Battery, Worth the Wait

To provide the highest-quality replacement battery, we ship this battery directly from the manufacturer rather than from aging warehouse inventory. This means delivery may take a little longer, but it helps ensure you receive a fresh battery with better performance, a longer lifespan, and greater reliability.

Estimated delivery: 7–10 business days
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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.

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🔹 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: 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.

Voltage

7.7V

Amp

4750mAh

Acer Aspire 3 A315-21 / A315-51 — 7.7V Li-Polymer Replacement Battery (AP16M5J)

This is a 7.7V, 4750mAh (36.58Wh) lithium-polymer battery for the Acer Aspire 3 A315-21 and A315-51 series laptops. It replaces OEM part AP16M5J and cross-references KT.00205.004 and KT.00205.005. The slim 5.42mm cell profile matches the chassis clearance on the A315 platform exactly.

  • A315-21 and A315-51 platform fit: Both series share the same 7.7V two-cell Li-Polymer architecture, identical connector pinout, and the same BMS handshake protocol. The replacement cell communicates over the same SMBus line, so the BIOS recognises it without flashing or workarounds.
  • Bench tested on actual hardware: We ran this cell on an A315-21 unit under a mixed CPU and display load. The BMS held voltage above the 6.4V low-cell cutoff throughout the discharge curve and accepted a full charge cycle without triggering a protection trip.
  • Post-install calibration on the A315 platform: After fitting, run the laptop on battery until it hibernates at cutoff — do not interrupt it. Then charge uninterrupted to 100%. This resets the BIOS battery learn cycle and clears the inaccurate health warning that appears on first boot after every cell swap.

Why the Aspire 3 shuts down at 20–30% after a battery swap

The A315 fuel gauge IC builds a discharge map against the original cell's internal resistance profile. When a new cell goes in, that map is stale — the IC thinks the voltage cliff arrives earlier than it actually does. Under combined CPU and display load, the controller sees what it interprets as a rapid voltage drop and triggers a shutdown before the cell is genuinely empty. Running one full discharge-to-hibernate cycle forces the IC to recalibrate its end-of-discharge voltage against the new cell. After two full cycles, the reported percentage tracks accurately.

BIOS showing wrong Wh rating after fitting the AP16M5J replacement

The Wh value shown in BIOS or Windows Battery Report is pulled from EEPROM data embedded in the cell's protection circuit, not measured directly. OEM cells and replacement cells can carry different EEPROM-programmed values even when the actual chemistry is identical. This is a data field mismatch, not a capacity fault. To confirm actual capacity, run a full discharge-charge cycle and check the Full Charge Capacity reading in Windows PowerCfg — type powercfg /batteryreport in an elevated command prompt and compare the reported full charge figure against the rated 36.58Wh.

Compatible Models

Aspire 3 A315-21 Aspire 3 A315-51 Aspire 3 A315-31-C514 N17Q2 Aspire 3 A315-21-62YQ Aspire 3 A315-21-63F1 Aspire 3 A315-21-97HC Aspire 3 A315-41G-R700 ASPIRE 3 A315-31-C58L ASPIRE A315-21G Extensa 15 EX215-51-54Y0 Aspire 3 A315-53-35VF A314-32-C52Q Aspire 3 A314-21-91V1 ASPIRE 3 A314-41-96NQ ASPIRE 3 A314-31-C0JE Extensa 15 EX215-31-C44N Aspire 3 A311-31-C8FN A315-41-R1PK Aspire 3 A315-42-R2G4 Aspire 1 A114-32-C1LH Aspire 3 A315-31-P5M0 Extensa 15 EX215-51K-30ZJ Aspire 3 A315-21G-92JR A315-41-R8NF ASPIRE 3 A315-34-P859 ASPIRE 1 A114-32-C8N6 Aspire 3 A315-32-C2L6 Extensa 15 EX215-51G-524W Aspire 3 A315-21G-97ZG Aspire 3 A315-33-C992 ASPIRE 3 A315-34-C6MU ASPIRE 1 A114-32-C9MJ Aspire 3 A315-32-C67Y Extensa 15 EX215-21-94ZY ASPIRE 3 A314-31-C29P Aspire 3 A315-32-C9ZY Aspire 3 A317-32-C7E2 ASPIRE 3 A315-21G-61UW Aspire 3 A315-33-C2F6 Aspire 3 A315-41-R6X5 ASPIRE 3 A314-31-C2L1 aspire 3 A315-41-R3LC aspire 3 A317-32-C60Z ASPIRE 3 A315-51-310J Aspire 3 A315-33-P40P Aspire 3 A315-51-373T Aspire 3 A315-51-51SL Aspire 3 A314-33-P7NL Aspire 3 A315-21-60AH Aspire 3 A315-21-66N1 ASPIRE 3 A314-31-P54P Aspire 3 A315-51-3286 Aspire 3 A314-32-P3SL Aspire 3 A315-21-43WX Aspire 3 A315-41-R001 ASPIRE 1 A114-31-C02W Aspire 3 A315-53-325R ASPIRE 3 A314-31-P9B4 Aspire 3 A315-41G-R5RJ ASPIRE 3 A315-31-C0DT Extensa 15 EX215-51-59Z5 Aspire 3 A315-53-5248 Aspire 3 A315-21-96P2 ASPIRE 1 A114-31-P47C Aspire A314-32-C129 Aspire 3 A315-51-32TV Extensa 15 EX215-21-47E8 Aspire 3 A311-31-C64M Aspire 3 A314-32 P8ZN Aspire 3 A314-21-900Z ASPIRE 3 A314-41-62TR Aspire 3 A315-31-C9QA Extensa 15 EX215-51K Aspire 3 A315-21G-979M A315-41-R5XG Aspire 3 A315-42-R5Y2 ASPIRE 1 A114-32-C3N0 Aspire 3 A315-32-C9ZC EX215-51G Aspire 3 A315-21G-93L5 Aspire 3 A314-32-C3D3 ASPIRE 3 A315-34-C55B ASPIRE 1 A114-32-C0TU Aspire 3 A315-32-P3US Extensa 15 EX215-21-99AW Aspire 3 A315-21G-65G1 Aspire 3 A315-33-N14U Aspire 3 A317-32-P62H ASPIRE 3 A314-32-P2MA Aspire 3 A315-33-C9RA Aspire 3 A315-34-P3LC Aspire 1 A111-31-C522 Aspire 3 A315-32-C7Q5 Aspire 3 A317-32-P5KF ASPIRE 3 A315-31-P5CC Aspire 3 A315-33-P1ZE Aspire 3 A315-51-32YG ASPIRE 3 A314-31-P6AB ASPIRE 3 A315-41G-R0B2 Aspire 3 A317-32-P09J ASPIRE 3 A314-33-P65Q Aspire 3 A315-51-314M Aspire 3 A315-51-59VZ Aspire 1 A114-31-P908 ASPIRE 3 A315-32-P3P7 Aspire 3 A315-21-69N7 Aspire 3 A315-41-R40X ASPIRE 1 A114-31-C2CM Aspire 3 A315-51-39N0 ASPIRE 3 A315-42-R7CM Aspire 3 A315-33-P6HG Aspire 3 A315-41-R9G9 ASPIRE 3 A315-41-R1PK Extensa 15 EX215-51G Aspire 3 A315-21-45K8 Aspire 3 A315-41G-R696 ASPIRE 3 A315-31-C8XR ASPIRE 3 A314-31-C6CE Extensa 15 EX215-51-32WX Aspire 3 A315-53-52VB Aspire 3 A315-21-969V Aspire 3 A315-41G-R5H7 ASPIRE 3 A315-31-C5QM Extensa 15 EX215-51-503P Aspire 3 A314-32-C2VP Aspire 3 A314-21-684V ASPIRE 3 A314-41-9649 A315-21-289H Extensa 15 EX215-31-C2BY Aspire 3 A311-31-C23K A315-41-R295 Aspire 3 A315-42-R3F7 Aspire 1 A114-32-C2W8 Aspire 3 A315-31-P72U Extensa 15 EX215-51K-35RZ Aspire 3 A315-21G-45AA A315-41G ASPIRE 3 A315-34-F14U ASPIRE 1 A114-32-C2VZ Aspire 3 A315-32-C3WY Extensa 15 EX215-51G-5007 ASPIRE 3 A315-21G-95YF Aspire 3 A315-33-C9B2 ASPIRE 3 A315-34-C6KM ASPIRE 1 A114-32-C7UQ Aspire 3 A315-32-C9CQ Extensa 15 EX215-31-C9SB Aspire 1 A111-31-C8TB Aspire 3 A315-32-P2LE Aspire 3 A317-32-P38H ASPIRE 3 A315-21G-668V Aspire 3 A315-33-C1VK Aspire 3 A315-41-R8NF Aspire 3 A315-41-R6R0 Aspire 3 A317-32-P9XB ASPIRE A315-21-49UK Aspire 3 A315-33-C91C Aspire 3 A315-51-388S Aspire 1 A114-31-C3RS ASPIRE 3 A315-51-54R5 Aspire 3 A314-33-P9QL Aspire 3 A315-21-9188 Aspire 3 A315-21-93FJ ASPIRE 1 A114-31-C3MM Aspire 3 A315-51-31X0 Aspire 3 A315-42-R3ZH Aspire 3 A315-21-66HG Aspire 3 A315-41-R0GH ASPIRE 1 A114-31-C837 Aspire 3 A315-53-373B A315-21-44YR Aspire 3 A315-41G-R5U3 ASPIRE 3 A315-31-C8WK Extensa 15 EX215-51-56R5 Aspire 3 A315-53-52CF Extensa 15 EX215-51-56GH Aspire 3 A315-53-38GM Aspire 3 A315-21-67U4 ASPIRE 1 A114-31-C4TQ Aspire A314-32-C2TE Aspire 3 A315-41G-R1A5 Extensa 15 EX215-21-4958 Aspire 3 A311-31-C9S8 Aspire 3 A314-32-C9E0 Aspire 3 A314-21-98MH ASPIRE 3 A314-41-649B Aspire 3 A315-31-P1R9 Extensa 15 EX215-51K-36YY Aspire 3 A315-21G-96T2 A315-41-R6X5 Aspire 3 A315-42-R6PT ASPIRE 1 A114-32-C79Z Aspire 3 A315-32-P3U1

Replaces Part Numbers

AP16M5J KT.00205.004 KT.00205.005 NX.GNSSA.003 NX.GNTSA.007 NX.GNVSA.013 NX.GNVSA.022 NX.GQ4SA.002 NX.GQ4SA.003 NX.GTHEU.001 NX.GTHEU.003 NX.GVWSA.002 NX.GVYSG.011 NX.GY9SA.005 NX.GY9SA.007 NX.H38SA.002

Technical Specifications

Voltage7.7V
Amp Hours4750mAh
Capacity4750mAh
Rate36.58Wh
Net Weight153.2g /5.40 oz
Gross Weight413.2g /14.58 oz
Approximate Weight413.2g /14.58 oz
Dimension 260.90 x 88.44 x 5.42mm

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 Aspire 3 A315-21 is reporting the new battery as "poor health" or "unknown" in Windows right after fitting — is the replacement cell faulty?

It is not a faulty cell. The BIOS carries EEPROM health data from the old battery, and on first boot it flags the new cell because that learned data does not match. Run one full discharge to hibernate-cutoff, then charge uninterrupted to 100% — this triggers the BIOS battery learn cycle and clears the health warning. Check Battery Report again after two full cycles using `powercfg /batteryreport` in an elevated command prompt.

The fuel gauge on my A315-51 is jumping around — showing 60%, then 45%, then back to 55% within minutes of unplugging. What causes that?

The fuel gauge IC on the A315 platform calibrates its state-of-charge algorithm against the internal resistance profile of the installed cell. After a swap, the IC is still using the old cell's resistance map, so voltage readings translate to wildly inaccurate percentages. Two full discharge-to-hibernate-then-full-charge cycles force the IC to rebuild the map against the new cell. After the second cycle the percentage readout stabilises.

New AP16M5J battery stopped charging at 80% and won't go higher — is something wrong with the cell?

Charge stopping at 80% is almost always a BIOS-controlled charge limit, not a cell fault. Acer's firmware includes a battery health mode that caps charge at 80% to reduce long-term cell stress — it ships enabled on some units. Open the Acer Care Center application, navigate to Battery Health Manager, and switch the mode from "Extended Battery Life" to "Balanced" or "Maximum Battery Life." After changing the setting, plug in and confirm charge continues past 80%.

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Acer Aspire 3 A315-21 Replacement Battery, 7.7V, 4750mAh, Li-Polymer 1

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