Samsung SCH-U940 Replacement Battery AB603443EZ 3.7V 1000mAh
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Samsung SCH-U940 Replacement Battery AB603443EZ 3.7V 1000mAh - 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.
Samsung SCH-U940 Replacement Battery AB603443EZ 3.7V 1000mAh - is backordered and will ship as soon as it is back in stock.
Voltage
3.7V
Amp
1000mAh
Samsung SCH-U940 / SCH-U940v — 3.7V Li-ion Replacement Battery (AB603443EZ)
This is a 3.7V, 1000mAh Li-ion cell for the Samsung SCH-U940 and SCH-U940v flip phones. It slots directly into the original battery bay and uses the same OEM connector footprint. Voltage and capacity match the AB603443EZ specification exactly.
- SCH-U940 and U940v compatibility: Both variants share the same battery bay dimensions, connector pinout, and 3.7V nominal voltage rail. The AB603443EZ part number covers both, so no hardware modification is needed to fit either model.
- Bench tested on actual hardware: We cycled this cell through charge and discharge on the SCH-U940 platform. The BMS accepted charge current without flagging an error state, and the protection circuit tripped correctly at the low-voltage cutoff threshold.
- Fuel gauge recalibration on first use: After fitting this cell, run one complete discharge down to automatic power-off, then charge uninterrupted to 100% before normal use. The phone's fuel gauge IC was calibrated to the old cell's discharge curve — this single full cycle resets the coulomb counter against the new cell's actual capacity.
Why the SCH-U940 reports wrong battery percentage after a cell swap
The SCH-U940 tracks charge state using a fuel gauge IC that builds a discharge curve over many cycles. When you swap in a new cell, that stored curve no longer matches the actual cell chemistry. The IC reads voltage against the old curve and outputs an incorrect percentage. One full discharge-to-cutoff followed by a complete uninterrupted charge resets the reference table and brings the display percentage back in line with real capacity.
Sudden shutdown at 20–30% on the replacement cell
This happens when the fuel gauge IC hasn't yet mapped the new cell's voltage cliff — the point where cell voltage drops sharply under load from the display or radio circuitry. The phone reads 20–30% on the old curve, but the actual cell voltage has already fallen below the BMS cutoff threshold under even moderate current draw. The fix is the same recalibration cycle: full discharge to auto power-off, then charge straight to 100%. After that cycle, the cutoff point should align correctly with what the display shows.
Compatible Models
Replaces Part Numbers
Technical Specifications
Product Highlights
- Brand: Samsung
- 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 SCH-U940 shows a percentage jumping around erratically after I put in the new battery — is something wrong with the cell?
Nothing is wrong with the cell. The fuel gauge IC is comparing the new cell's voltage readings against a discharge curve it built from the old, degraded battery. The mismatch causes the displayed percentage to jump as voltage shifts don't match expected values. Run one full discharge to automatic power-off and then charge uninterrupted to 100% — the coulomb counter will reset against the new cell and the percentage readout will stabilise.
The phone feels warm near the battery compartment while charging the new cell — should I be concerned?
Mild warmth on the first few charge cycles is normal. A new cell has higher internal impedance than a well-cycled one, so the charge IC dissipates slightly more energy as heat until the cell's impedance settles. If the phone becomes hot to the touch or the charge IC shuts down mid-cycle, remove the battery and inspect the contacts for corrosion or misalignment. On a correctly seated AB603443EZ cell, surface temperature should drop to near-ambient after the second or third full charge cycle.
The SCH-U940 won't power on at all after the replacement battery sat in a drawer for several months — how do I recover it?
A cell stored at low charge for months can drop below 2.5V per cell, which triggers a BMS lockout that prevents the phone from powering on normally. Connect the phone to a wall charger — not a USB port — and leave it for at least 30 minutes without pressing the power button. The charge IC will apply a low-current trickle to bring the cell voltage back above the BMS recovery threshold, typically around 2.9V, before switching to normal charge current. If the charging indicator doesn't appear within 45 minutes, check that the battery contacts are clean and fully seated.
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