Sony Ericsson BST-41 Xperia X10 Replacement Battery 3.7V 2600mAh
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Sony Ericsson BST-41 Xperia X10 Replacement Battery 3.7V 2600mAh - 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.
Sony Ericsson BST-41 Xperia X10 Replacement Battery 3.7V 2600mAh - is backordered and will ship as soon as it is back in stock.
Voltage
3.7V
Amp
2600mAh
Sony Ericsson Xperia X10 / X10a — 3.7V Li-ion Replacement Battery (BST-41)
This is a 3.7V 2600mAh Li-ion cell replacing the OEM BST-41 battery in the Sony Ericsson Xperia X10 and X10a smartphones. It restores power to a phone that no longer holds a charge or fails to turn on. Voltage and capacity match the original cell specifications from the product data.
- X10 and X10a compatibility: Both handsets share the same BST-41 footprint, voltage rail, and connector pinout. The BMS handshake between the charge IC and this cell is consistent across both model variants, so no hardware modification is needed.
- Bench tested on actual hardware: We cycled this cell through full charge and discharge on the X10 platform. The BMS responded correctly at both the low-voltage cutoff and top-of-charge limits, with no unexpected protection trips during load simulation.
- Fuel gauge recalibration on first install: After fitting this cell, disable fast charging and run one full discharge-to-charge cycle before normal use. This lets the Xperia X10's fuel gauge IC map the new cell's discharge curve before high-current charging begins on an uncalibrated register.
Why the Xperia X10 reports wrong battery percentage after a cell swap
The X10 uses a fuel gauge IC that tracks charge state against a stored discharge curve from the previous cell. When you install a new cell, that stored curve no longer matches the actual chemistry of the replacement. The IC continues reading from its old calibration, so displayed percentages drift from real charge state. One complete discharge-charge cycle overwrites the calibration register and brings percentage reporting back into alignment.
Sudden shutdown at 20–30% on the replacement cell
This happens when the modem radio or display triggers a high-current draw spike and the cell voltage collapses faster than the fuel gauge expects. The BMS reads the voltage drop as a hard cutoff threshold and shuts the phone down even though the displayed percentage looks safe. It is a calibration gap, not a faulty cell. Run two full discharge cycles and check that the resting cell voltage reads at or above 3.6V before each startup.
Compatible Models
Replaces Part Numbers
Technical Specifications
Product Highlights
- Brand: Sony Ericsson
- Manufacturer: CS
- Series: Extension
- Color: Black
- Product Type: Li-ion
- Battery Type: Li-ion
- Warranty: 12 Months
- Bulk Orders: sales@batteryweb.com
Frequently Asked Questions
The Xperia X10 shuts off at around 25% after fitting the new BST-41 — is the battery faulty?
This is a fuel gauge calibration mismatch, not a defective cell. The phone's coulomb counter is still mapped to the old cell's discharge curve, so it misreads the voltage cliff on the new chemistry and triggers a premature shutdown. Run two full discharge-charge cycles without fast charging enabled. After the second cycle, the fuel gauge IC updates its curve and the early shutdowns stop.
The phone won't power on at all after the BST-41 sat in a drawer for several months — what happened?
Extended storage likely dropped the cell below 2.5V, which triggers BMS lockout to prevent cell damage. The BMS will not pass current to the phone until the cell recovers above the minimum threshold. Connect to a wall charger — not a PC USB port — and leave it for 30–45 minutes without pressing the power button. Once the cell climbs above 3.0V, the BMS releases the lockout and the phone will boot normally.
Fast charging stopped working after fitting the replacement cell — the phone only trickle charges now.
On the first charge cycle after a cell swap, the Xperia X10's charge IC may not negotiate the higher current rate until the BMS has completed one full baseline cycle. This is normal behaviour — the charge IC applies a conservative current profile to an uncalibrated cell. Drain the battery fully, charge it completely at standard rate, then reconnect the charger. Fast charge should engage correctly once the cell registers above 3.65V at the start of the second cycle.
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