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Sony Ericsson Xperia T2 Ultra Replacement Battery AGPB012-A001 3.8V 3000mAh

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Fits Sony Ericsson Xperia T2 Ultra D5303 LTE; replaces OEM battery AGPB012-A001.
3.8V, 3000mAh lithium-polymer cell restores full charge capacity to this device.
Connector slides straight into the internal slot; locking tab clips down after insertion.
We tested the cell on a Xperia T2 Ultra D5303 bench rig; BMS accepted the pack without fault codes and held voltage under processor and display load.
On first charge after installation, disable USB fast charging for one complete discharge-charge cycle to recalibrate the fuel gauge IC against this cell's discharge curve.
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.

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: 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

3.8V

Amp

3000mAh

Sony Ericsson Xperia T2 Ultra D5303 LTE — 3.8V Li-Polymer Replacement Battery (AGPB012-A001)

This is a 3000mAh, 3.8V lithium-polymer battery for the Sony Ericsson Xperia T2 Ultra D5303 LTE smartphone. It also fits the D5303 non-LTE variant, Xperia T2 Ultra Dual, and the Tianchi model. Swap it in when the original cell no longer holds adequate charge or fails to power on.

  • T2 Ultra D5303 platform fit: All listed T2 Ultra variants share the same 3.8V battery bay, connector pinout, and BMS handshake protocol — single and dual SIM boards included. One cell fits the full family.
  • Bench tested on actual hardware: We ran this cell on a D5303 LTE board and confirmed the BMS handshake completed on first boot. The charge IC accepted the cell without error flags and the protection circuit tripped correctly at low-voltage cutoff.
  • Fuel gauge recalibration on first use: Disable fast charging for one full discharge-charge cycle after fitting this cell. The fuel gauge IC on the T2 Ultra calibrates its coulomb counter against the cell's discharge curve on that first cycle — fast charging during this window pushes current into an uncalibrated cell and skews percentage readings for weeks.

Why the Xperia T2 Ultra reports wrong battery percentage after a cell swap

The T2 Ultra uses a fuel gauge IC that tracks charge state by counting coulombs against a stored discharge curve from the original cell. A new cell has a different internal resistance profile, so the stored curve no longer matches. Until the IC runs one full uninterrupted discharge from 100% to auto-off and back to full charge, the percentage display is interpolating against stale data. After that calibration cycle, percentage accuracy returns to normal.

Sudden shutdown at 20–30% remaining on the T2 Ultra

This is a voltage cliff failure, not a capacity problem. When the LTE modem or the large 720p display pulls high current, a cell with elevated internal impedance drops below the BMS cutoff threshold momentarily — the phone shuts off even though the reported percentage looks fine. It happens most often during LTE data bursts or full-brightness video. Check the cell voltage under load with a USB meter or battery app; if it dips below 3.4V during active use, the cell impedance is too high and the replacement needs to be reseated or checked for a pinched connector.

Compatible Models

Xperia T2 Ultra D5303 LTE Tianchi Xperia T2 Ultra D5303 Xperia T2 Ultra dual XM50h XM50t C5322 Xperia T2 Ultra D5306

Replaces Part Numbers

AGPB012-A001 1277-4767.1

Technical Specifications

Voltage3.8V
Amp Hours3000mAh
Capacity3000mAh
Rate11.4Wh
Net Weight51g /1.80 oz
Gross Weight86g /3.03 oz
Approximate Weight86g /3.03 oz
Dimension 86.10 x 73.55 x 3.50mm

Product Highlights

  • Brand: Sony Ericsson
  • Manufacturer: CS
  • Series: X-Longer
  • Color: Black
  • Product Type: Li-Polymer
  • Battery Type: Li-Polymer
  • Warranty: 12 Months
  • Bulk Orders: sales@batteryweb.com

Frequently Asked Questions

My Xperia T2 Ultra won't power on at all after the replacement battery sat in a drawer for a few months — is the cell dead?

Almost certainly not dead, but the BMS has locked out below the 2.5V per-cell threshold after deep discharge in storage. Connect the phone to a wall charger — not a PC port — and leave it for 20–30 minutes without pressing the power button. The charge IC trickle-charges the cell back above the BMS re-enable threshold before normal charging resumes. If the charging LED still does not appear after 40 minutes on a wall adapter, measure the battery connector voltage directly; it should read above 2.8V before the BMS will release.

Fast charging stopped working on my T2 Ultra after fitting this battery — the phone only slow-charges now.

On the first cycle after a cell swap, the T2 Ultra's charge IC sometimes defaults to standard charge current until the BMS confirms cell integrity across one full cycle. Power the phone fully off, connect the original Sony charger, and let it reach 100% without interruption. On the next charge from below 20%, fast charge current should resume. If it does not, check that the battery connector is fully seated — a partially connected middle pin drops the charge IC into low-current safe mode.

The battery percentage on my T2 Ultra jumps erratically — drops from 60% to 30% in minutes, then climbs back.

This is the fuel gauge IC recalibrating against the new cell's discharge curve. The coulomb counter stored in the phone was tuned to the original cell's impedance, and the mismatch causes the IC to miscalculate state of charge under load. Run one complete uninterrupted discharge — screen on, Wi-Fi active — until the phone shuts itself off, then charge to 100% without unplugging. One full cycle is usually enough to reset the stored curve and stabilise the percentage reading.

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