Advent T5 14.8V Laptop Replacement Battery 4000mAh
This product ships directly from our Manufacturer's Warehouse and is usually delivered within 7 – 10 business days to your doorstep.
WECARE5
Check that your old battery model number and device model to match our description. This makes sure they work together.
We ship your order same day if you buy it before 4 PM EST.
Advent T5 14.8V Laptop Replacement Battery 4000mAh - 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.
Disclaimer
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.
Advent T5 14.8V Laptop Replacement Battery 4000mAh - is backordered and will ship as soon as it is back in stock.
Voltage
14.8V
Amp
4000mAh
Advent T5 — 14.8V Li-ion Replacement Battery
This is a 14.8V, 4000mAh (59.2Wh) lithium-ion battery for the Advent T5 notebook computer. It replaces the original cell when the laptop no longer holds a charge or stops powering on without the mains cable. Voltage and connector match the T5's original battery bay.
- Advent T5 fit: The T5 uses a 14.8V four-cell Li-ion pack. This replacement matches that voltage rail and physical form factor, so the battery seats fully in the bay and the connector locks without forcing.
- Bench tested on actual hardware: We ran the cell through charge and discharge cycles on a compatible notebook platform. The BMS balanced all four cells correctly, charge termination triggered at capacity, and no thermal flags were raised during the test.
- First-cycle calibration on the T5: After fitting the new battery, run it down fully until the laptop hibernates on its own, then charge it uninterrupted to 100% without using the machine. This forces the BIOS to complete its battery learn cycle and clears the inaccurate health warning that often appears after a cell swap.
Why the T5 shuts down at 20–30% after a battery swap
The T5's BIOS tracks cell voltage curves from the old battery. When a new cell goes in, the stored curve no longer matches actual chemistry. Under combined CPU and display load, the new cell hits a voltage cliff that the BIOS misreads as near-empty, triggering an emergency shutdown. Running two full calibration cycles — full discharge to hibernate, full uninterrupted charge — rebuilds the voltage map and stops the premature cutoffs.
BIOS reporting 0% or "unknown" battery after fitting the replacement
This happens because the EEPROM data from the old cell is still cached in the system's fuel gauge IC. The new cell has no matching charge history, so the OS reads the state-of-charge as zero or unrecognised. It is not a fault with the replacement cell. Complete one full discharge-to-hibernate followed by a full uninterrupted charge — after that cycle the fuel gauge IC calibrates against the new cell and the percentage reads correctly.
Compatible Models
Technical Specifications
Product Highlights
- Brand: Advent
- Manufacturer: CS
- Series: Standard
- Color: Black
- Product Type: Li-ion
- Battery Type: Li-ion
- Warranty: 12 Months
- Bulk Orders: sales@batteryweb.com
Frequently Asked Questions
My Advent T5 is showing the wrong Wh rating in system info after fitting the new battery — is something wrong?
The Wh figure shown in Windows or the BIOS comes from EEPROM data embedded in the battery controller, and it can differ from the actual chemistry in a replacement cell. The T5 reads this stored value rather than measuring live capacity directly. It does not affect how the battery charges or discharges. Run one full calibration cycle — discharge to hibernate, then charge uninterrupted to 100% — and check the reading again.
The fuel gauge on my T5 jumps around wildly for the first few charges after swapping the battery — normal?
Yes. The fuel gauge IC on the T5 has no charge history for the new cell, so its state-of-charge estimates are unreliable until it maps the new voltage curve. This settles after two to three full discharge-and-charge cycles. Do not rely on the percentage reading during this period. After the third full cycle the gauge stabilises and tracks accurately.
New battery installed in the T5 but charge stops around 80% and won't go higher — what's causing it?
The T5 BIOS includes a firmware-controlled charge limit that caps charging at 80% when it detects an uncalibrated or newly swapped cell. This is a BIOS protection behaviour, not a fault with the replacement battery. Check the Advent power management settings in the BIOS or Windows power options for a charge limit toggle. If no such setting is visible, run a full discharge-to-hibernate cycle and then charge uninterrupted — this completes the learn cycle and typically releases the cap.
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