Galaxy S II EB-L1D7IBA Compatible Battery 3.7V 1800mAh
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Galaxy S II EB-L1D7IBA 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.
Disclaimer
Disclaimer
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🔹 We use these names, brands, or model numbers only for identification and compatibility purposes.
Galaxy S II EB-L1D7IBA Compatible Battery 3.7V 1800mAh - is backordered and will ship as soon as it is back in stock.
Voltage
3.7V
Amp
1800mAh
T-Mobile Galaxy S II SGH-T989 — 3.7V Li-ion Replacement Battery (EB-L1D7IBA)
This is a 3.7V, 1800mAh Li-ion battery for the T-Mobile Galaxy S II (SGH-T989). It replaces OEM part EB-L1D7IBA and fits directly into the original battery bay. Cells degrade over charge cycles — this unit restores power to the processor, display, and wireless radios.
- SGH-T989 fit: The T989 uses a specific connector orientation and contact pitch that matches this cell's terminal layout. The BMS embedded in this pack communicates with the Galaxy S II's charge IC over the same three-pin interface as the original EB-L1D7IBA.
- Bench tested on actual hardware: We cycled this battery through charge and discharge on a T989 unit. The BMS held upper cutoff at 4.2V and triggered low-voltage cutoff cleanly without tripping the phone into a hard shutdown loop.
- Fuel gauge recalibration on first use: After installing this cell, disable fast charging and run one full discharge to 5% followed by a complete charge to 100%. This gives the coulomb counter a known baseline against the new cell's discharge curve before high-current charging begins.
Sudden shutdown at 20–30% on the SGH-T989
This is a voltage cliff issue. As Li-ion cells age, their internal resistance rises — under screen or modem load, voltage drops sharply even when the fuel gauge still shows charge remaining. The phone's hardware protection circuit reads real-time cell voltage, not the fuel gauge estimate, so it shuts down when voltage sags below the cutoff threshold. A fresh cell with lower internal resistance eliminates the sag. After fitting this replacement, run one full cycle so the coulomb counter re-maps the discharge curve — reported percentage will stabilise by the second cycle.
Phone reports wrong battery percentage after cell swap
The Galaxy S II's fuel gauge IC stores a learned discharge model calibrated to the old cell's impedance and capacity curve. After a replacement, that model no longer matches the new cell — the chip interpolates incorrectly and shows skewed percentages. This causes jumps, stalls at certain levels, or early low-battery warnings. One full discharge from 100% down to automatic shutdown, then a full uninterrupted charge, forces the fuel gauge IC to rebuild its reference curve against the new cell. Percentages should read accurately within two cycles.
Compatible Models
Replaces Part Numbers
Technical Specifications
Product Highlights
- Brand: T-Mobile
- Manufacturer: CS
- Series: X-Longer
- Color: Black
- Product Type: Li-ion
- Battery Type: Li-ion
- Warranty: 12 Months
- Bulk Orders: sales@batteryweb.com
Frequently Asked Questions
My T-Mobile Galaxy S II shuts off at around 25% after I put in the new battery — is something wrong with the replacement?
Nothing is wrong with the cell. The phone's hardware protection circuit monitors real-time voltage at the terminals, not the fuel gauge reading. Under screen-on or LTE modem load, a new cell that hasn't been calibrated yet can show a voltage dip the circuit interprets as a low-voltage event. Run one full discharge cycle — let the phone drain to automatic shutdown, then charge uninterrupted to 100% — and the coulomb counter will remap to the new cell's actual discharge curve. Shutdowns at 20–30% should stop after that first complete cycle.
The battery percentage on my SGH-T989 jumps around or gets stuck after the swap — it went from 60% to 40% in two minutes without me doing anything.
The fuel gauge IC on the Galaxy S II learned the discharge model of your original EB-L1D7IBA cell over hundreds of cycles. That stored curve doesn't match the new cell's impedance profile, so the chip interpolates badly and produces erratic readings. The fix is one full reference cycle: charge to 100%, discharge to automatic shutdown without interruption, then charge fully again. After two cycles the fuel gauge IC recalibrates and percentage readings stabilise. No app or reset is needed — the hardware handles it automatically once it has a clean cycle to read.
My Galaxy S II won't power on at all after the new battery sat in a drawer for a few weeks before I installed it.
If a Li-ion cell discharges below approximately 2.5V during storage, the BMS locks out to prevent damage from over-discharge. The phone won't respond to the power button because the protection circuit blocks current flow until voltage recovers to a safe threshold. Connect the phone to a wall charger — not a PC USB port — and leave it for 20–30 minutes without pressing anything. The charge IC will trickle current into the cell to bring it above the BMS re-enable threshold, after which the phone will boot normally. If the charge indicator light doesn't appear within 5 minutes, check that the battery contacts are fully seated.
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