Acer AP19B5L TravelMate P2 Replacement Battery 15.4V 3500mAh
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Acer AP19B5L TravelMate P2 Replacement Battery 15.4V 3500mAh - 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 AP19B5L TravelMate P2 Replacement Battery 15.4V 3500mAh - is backordered and will ship as soon as it is back in stock.
Voltage
15.4V
Amp
3500mAh
Acer TravelMate P2 TMP215-41-R74Q — 15.4V Li-Polymer Replacement Battery (AP19B5L)
This is a 15.4V, 3500mAh (53.9Wh) lithium-polymer battery for the Acer TravelMate P2 TMP215-41-R74Q and a broad range of compatible Acer laptops including the Enduro Urban N3 EUN314-51W and Swift 3 SF314-512 series. It replaces OEM part numbers AP19B5L and KT00405010. Install it when the original cell no longer holds a useful charge or the system shuts down unexpectedly under load.
- TravelMate P2 and Swift 3 platform fit: These Acer models share a common 15.4V four-cell Li-Polymer architecture, identical connector pinout, and the same BMS communication protocol over the SMBus line — that is why one part number covers all of them.
- Bench tested on actual hardware: We ran this cell through charge and discharge cycles on a TMP215-series unit. The BMS handshake completed on first connect, the BIOS recognised the pack without flagging an unknown device, and the protection circuit responded correctly at both low-voltage cutoff and thermal limits.
- Post-swap calibration on the TravelMate P2: After fitting this battery, run the laptop down to hibernate cutoff on battery power only — no AC — then charge uninterrupted to 100%. This forces the BIOS battery learn cycle to reset against the new cell and clears the inaccurate health warning that appears after every cell swap on this platform.
Why the TravelMate P2 shuts down at 20–30% after a battery swap
The fuel gauge IC on this platform stores a learned voltage-to-capacity curve from the previous cell. When a new cell goes in, that stored curve no longer matches the actual discharge profile of the new chemistry. Under full CPU plus display load, voltage drops faster than the old curve predicts, and the system hits its emergency cutoff before the gauge reaches zero. Running two to three full discharge-to-hibernate cycles recalibrates the IC against the new cell. After calibration, the cutoff point will track correctly — expect it to align at or below 5% remaining.
BIOS reporting 0% or "unknown battery" immediately after fitting
This happens because the EEPROM data broadcast by the new cell does not match what the BIOS cached from the old pack. The system flags the pack as unknown rather than reading it as degraded. Power the laptop fully off, reseat the battery connector firmly, then boot into BIOS setup and navigate to the battery health or power section — this forces a fresh SMBus query. If the BIOS still shows 0%, a single full charge cycle from flat typically resets the fuel gauge register to a valid state.
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 TravelMate P2 shows the new battery at 53Wh in system info but Windows reports a different design capacity — which is correct?
The 53.9Wh figure in Windows Device Manager comes from the EEPROM embedded in the new cell and reflects the actual rated chemistry of this pack. Windows "design capacity" pulls from a cached value written by the original battery and may not update until the fuel gauge IC completes one full calibration cycle. Run a full discharge to hibernate then charge to 100% without interruption. After that cycle, both figures should align at or close to 53.9Wh.
The charge indicator on the TravelMate P2 stops at 80% and will not go higher — is the new battery faulty?
This is almost always a BIOS-controlled charge limit, not a cell fault. Acer's power management firmware includes a battery health mode that caps charging at 80% to reduce cell stress — it ships enabled on some units and can be toggled on silently after a driver update. Check Acer Care Center or the BIOS Power settings for a "Battery Health Mode" or "Charge Limit" toggle and disable it. Once off, the next charge cycle will run to 100%.
After the swap, the battery percentage jumps around wildly — 60%, then 45%, then back to 55% — within minutes of unplugging
The fuel gauge IC on this Acer platform needs several full cycles against the new cell before its capacity readings stabilise. The erratic percentages are the IC interpolating from a curve built on the old cell's internal resistance profile, which does not match the new pack. Do not use partial charges for the first three cycles — discharge fully to hibernate cutoff each time, then charge uninterrupted to 100%. By the third cycle the gauge will have enough data to track the new cell accurately.
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