Sony Ericsson Xperia ion 1251-9510.1 Compatible Battery 3.7V 1800mAh
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Sony Ericsson Xperia ion 1251-9510.1 Compatible Battery 3.7V 1800mAh - 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
⚠️ 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.
Sony Ericsson Xperia ion 1251-9510.1 Compatible Battery 3.7V 1800mAh - is backordered and will ship as soon as it is back in stock.
Voltage
3.7V
Amp
1800mAh
Sony Ericsson Xperia ion LT28 Series — 3.7V Li-Polymer Replacement Battery (LIS1485ERPC)
This is a 3.7V, 1800mAh Li-Polymer replacement battery for the Sony Ericsson Xperia ion smartphone. It fits the LT28, LT28i, and LT28at model variants. Drop the original part numbers — it cross-references OEM codes 1251-9510.1, LIS1485ERPC, LIS1489ERPC, and 1251-9510.1C.
- LT28 variant compatibility: The LT28, LT28i, and LT28at share the same battery bay dimensions, connector pinout, and BMS handshake protocol. Swapping between these variants uses the same cell — voltage rail stays at 3.7V nominal across all three.
- Bench tested on actual hardware: We ran this cell on an LT28i and monitored the BMS during charge cycles. The protection circuit engaged at both the 4.2V charge cutoff and the low-voltage discharge floor without fault codes.
- Fuel gauge recalibration after install: On first use after swapping this cell in, let the phone discharge to automatic shutdown, then charge to 100% without interruption. The Xperia ion's fuel gauge IC maps its charge curve to the new cell during this first full cycle — skipping it causes the percentage counter to read inaccurately for days.
Why the Xperia ion reports wrong battery percentage after a cell swap
The Xperia ion uses a coulomb counter in its fuel gauge IC that was calibrated to the discharge curve of the original cell. When a new cell goes in, that stored curve no longer matches actual cell behaviour. The IC continues using the old data until it completes a full discharge-to-charge cycle with the new cell. Until that cycle runs, percentage readings can sit 10–20% above or below actual charge state.
Sudden shutdown at 20–30% on the replacement cell
This happens when the cell voltage drops below the modem or display's minimum operating threshold before the percentage counter reaches zero — a voltage cliff caused by the uncalibrated fuel gauge IC. The phone sees 25% remaining but the cell is already sagging under load. The fix is the same full recalibration cycle: discharge completely to auto-shutdown, then charge uninterrupted to 100%. After one complete cycle, the IC anchors its model to the new cell's actual 3.0V floor.
Compatible Models
Replaces Part Numbers
Technical Specifications
Product Highlights
- Brand: Sony Ericsson
- 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
The Xperia ion shuts off suddenly when the battery still shows 25% — is the replacement cell faulty?
Not usually. The fuel gauge IC on the LT28 was calibrated to the original cell's discharge curve, and a new cell has a different voltage profile under load. When the modem or display pulls current, the cell voltage sags below the minimum operating threshold before the counter hits zero — the phone cuts out. Run one full uninterrupted discharge-to-charge cycle and the IC will recalibrate to the new cell. After that cycle, the shutdown floor should align with the percentage counter.
The phone won't power on at all after the replacement battery sat in storage for a few months before installation — what happened?
Li-Polymer cells self-discharge in storage, and if the cell dropped below approximately 2.5V per cell, the BMS entered lockout mode to prevent damage. The phone won't respond to a standard charger in this state. Connect the phone to a wall charger — not a PC USB port — and leave it for 20–30 minutes without attempting to power on. Most LT28 charge ICs will trickle-charge a locked-out cell back above the BMS recovery threshold; the phone should show a charging indicator once voltage clears 3.0V.
Fast charging stopped working after fitting the replacement battery — the phone charges slowly on the same cable and charger that worked before.
On the first charge cycle after a cell swap, the Xperia ion's charge IC sometimes defaults to a reduced current rate while it assesses the new cell's impedance. This is normal behaviour and not a fault with the charger or cable. Let the phone complete one full charge to 100% at the reduced rate. On subsequent cycles the charge IC recognises the cell's internal resistance profile and resumes normal charge current — no settings change or reset is needed.
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