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Acer Aspire S 13 AP15O5L Compatible Battery 11.55V 4600mAh

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From $109.99 USD $130.99
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Fits Acer Aspire S 13 series laptops, replaces AP15O5L, AP1503K, AP15O3K, AP1505L battery packs.
11.55V, 4600mAh lithium-polymer cell delivers 53.13Wh to sustain full CPU and display load cycles.
Connector slides straight into the existing slot with positive and negative terminals keyed; locking tab secures forward.
Bench tested on S5-371 hardware—BMS accepted charge immediately, voltage held steady under sustained load draw.
After installation, run one complete discharge to shutdown then charge uninterrupted to 100% to reset the BIOS battery learn cycle and clear inaccurate health warnings.
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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.

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: 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

11.55V

Amp

4600mAh

Acer Aspire S 13 S5-371 — 11.55V Li-Polymer Replacement Battery (AP15O5L)

This is an 11.55V, 4600mAh (53.13Wh) lithium-polymer battery for the Acer Aspire S 13 series ultrabook. It replaces OEM part numbers AP15O5L, AP1505L, AP1503K, and AP15O3K. Fits the S5-371 chassis and all sub-models on that platform.

  • S5-371 platform compatibility: Every S5-371 variant — including the 52JR and 53NX — runs the same 11.55V three-cell Li-Polymer architecture with a shared connector pinout and BMS handshake protocol. One cell covers the full range.
  • Bench tested on actual hardware: We cycled this cell on an S5-371 unit and confirmed the BMS completes charge handshake correctly, holds voltage above 10.8V at full CPU and display load, and does not trigger an early cutoff under sustained draw.
  • First-cycle calibration on the S5-371: After installing, run one full discharge until the laptop hibernates on its own, then charge uninterrupted to 100%. This resets the BIOS battery learn cycle and clears the inaccurate health warning the S5-371 displays after every cell swap.

BIOS reporting poor battery health immediately after fitting a new cell

The S5-371 BIOS reads health data stored in the old cell's EEPROM before the new cell has completed a learn cycle. Until calibration runs, the firmware compares current state-of-charge against stale reference data and flags the battery as degraded. This is not a fault with the replacement cell. One full discharge-to-hibernate followed by an uninterrupted charge to 100% gives the BIOS a fresh reference point and clears the warning on next boot.

Laptop shuts down at 20–30% shown on the OS fuel gauge

This happens when the fuel gauge IC has not yet calibrated against the new cell's actual voltage curve. The gauge shows 20–30% remaining, but the cell voltage has already dropped below the BMS cutoff threshold — typically around 9.9V under load on this platform. The system shuts down to protect the cell even though the percentage looks safe. Run two to three full discharge-to-charge cycles and the OS gauge will align with real cell voltage. After calibration, the shutdown point moves back to below 5% as expected.

Compatible Models

Aspire S 13 Aspire S13 S5-371 Aspire S 13 S5-371-52JR Aspire S13 S5-371-53NX Aspire S 13 S5-371T-58CC Chromebook R13 CB5-312T-K8Z9 SF514-51-558U Chromebook R13 CB5-312T Chromebook R13 CB5-312T-K5X4 SF514-51-77S5 Chromebook R13 CB5-312T-K0YK Swift 5 Aspire S13 S5-371-71QZ Aspire S5-371-56VE Aspire S5-371-597C Aspire S5-371-7278 Aspire S5-371-767P Aspire S5-371T-537V Aspire S5-371T-76CY Aspire S13 S5-371-563C Aspire S13 S5-371-52JR Aspire S5-371-572Z Aspire S5-371-70P9 Aspire S5-371-72W0 Aspire S5-371-76H0 Aspire S5-371T-57WW Aspire S5-371T-76UX Aspire S13 S5-371-5018 Aspire S5-371-55AH Aspire S13 S5-371-76WD Aspire S5-371-5693 Aspire S5-371-5744 Aspire S5-371-71QZ Aspire S5-371-74YU Aspire S5-371-757T Aspire S13 S5-371-76GS Aspire S5-371-52UK S5-371 Aspire S5-371 Aspire S13 Aspire S5-371T Aspire S5-371T-58CC Aspire S5-371T-716G Aspire S13 S5-371-77A7 Aspire S13 S5-371-75AM Swift 5 SF514-51-780R Aspire S13 S5-371-51HD Aspire s5-371-37e1 Aspire S5-371T-72KV Aspire S13 S5-371-50TM Aspire S13 S5-371-79SC Swift 5 SF514-51-58K4 Aspire S13 S5-371-767Q Aspire S5-371-7771 Swift 5 SF514-51-56BX Aspire S13-S5-371-54DZ ASPIRE S5-371T-769W Aspire S13 S5-371-537B Swift 5 SF514-51-740J Aspire S13 S5-371-53TZ Aspire S5-371T-731E Aspire S5-371T-71GK Aspire S13 S5-371-51UC ASPIRE S5-371-54D2 Swift 5 SF514-51-77WD Aspire S13 S5-371-767P Aspire s5-371-39dn Aspire S5-371T-78TA Aspire S13 S5-371-534X Aspire S13 S5-371-74H1 SWIFT 5 SF514-51-75W4 Aspire S13 S5-371-55DC Aspire S5-371-381P Swift 5 SF514-51-557Q Aspire S13 S5-371-52B5 Aspire S13 S5-371-59NW Aspire S13 S5-371-77XY Aspire S5-371-5946 Swift 5 SF514-51-59AV Aspire S13 S5-371-56J9 Aspire S5-371T-52SW Aspire S5-371T-56Q1 Aspire S13 S5-371-56EZ Aspire S13 S5-371-387P Swift 5 SF514-51-760M Aspire S13 S5-371-359E ASPIRE S5-371T-52YV Aspire S13 S5-371-52UK Swift 5 SF514-51 Aspire S13 S5-371-56VE

Replaces Part Numbers

AP15O5L AP1503K AP15O3K AP1505L

Technical Specifications

Voltage11.55V
Amp Hours4600mAh
Capacity4600mAh
Rate53.13Wh
Net Weight215g /7.58 oz
Gross Weight475g /16.76 oz
Approximate Weight475g /16.76 oz
Dimension 276.56 x 118.23 x 3.74mm

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 Acer Aspire S 13 now shows the wrong Wh rating in system info after swapping the battery — is something wrong?

The Wh figure in system information is pulled from the cell's EEPROM, not measured in real time. If the EEPROM on the replacement cell carries a slightly different rated value than the original, Windows or the BIOS will display that number instead. This is a data difference, not a capacity fault. Confirm the physical cell specs match — 11.55V, 53.13Wh — and ignore the system info figure until one full calibration cycle completes.

The charge stops at 80% and won't go higher — why is the new battery stuck there?

The S5-371 BIOS includes a charge-limit feature that caps charging at 80% when enabled in Acer Care Center or the BIOS power settings. This is firmware-controlled and has nothing to do with the replacement cell. Go into the BIOS or Acer Care Center, locate the battery health charging mode, and switch it from "Best Battery" to "Standard." The cell will then charge to 100%.

The OS fuel gauge reads wildly different percentages from one minute to the next after fitting this battery — jumping 15% at a time.

The fuel gauge IC is still calibrating against the new cell's voltage-to-capacity curve. The old cell's discharge profile was mapped over hundreds of cycles; the new cell's curve is unknown to the IC until it runs through full cycles itself. Erratic jumps are normal for the first two to three full discharge-to-charge cycles. After that the gauge stabilises — if it does not settle by cycle four, discharge fully to hibernate-cutoff at approximately 9.9V and recharge uninterrupted to 100%.

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