About this replacement
Samsung SGH-L760 Series — 3.7V Li-ion Replacement Battery (AB553443DE)
This is a 3.7V, 800mAh Li-ion cell for the Samsung SGH-L760, SGH-L768, and SGH-Z620 flip phones. It replaces OEM part numbers AB553443DE and AB553443BE. The battery slots directly into the rear compartment and connects to the device's charge IC via the standard three-contact terminal strip.
- SGH-L760, L768, and Z620 compatibility: These three models share the same battery bay dimensions (46.50 × 34.05 × 5.52mm), identical three-pin connector layout, and the same charge IC voltage thresholds — all three accept this cell without modification.
- Bench tested on actual hardware: We cycled this cell through charge and discharge on the SGH-L760 platform. The BMS accepted the charge handshake correctly, held cutoff at 4.2V charge termination, and triggered low-voltage protection at the expected floor without fault codes.
- Fuel gauge recalibration on first cycle: After installing this cell, run one full discharge to auto-off, then charge uninterrupted to 100% before normal use. The SGH-L760's fuel gauge IC was calibrated to the original cell's discharge curve — one complete cycle resets the coulomb counter against the new cell so percentage readings track accurately.
Sudden shutdown at 20–30% on the SGH-L760 after a cell swap
This happens because the fuel gauge IC still references the old cell's discharge curve. A fresh Li-ion cell has slightly different internal resistance characteristics, so the voltage drop under modem transmit load hits the hardware cutoff threshold before the percentage counter reaches zero. The phone reads 25% but the cell voltage has already sagged below the protection floor. One full discharge-charge cycle lets the coulomb counter remap to the new cell, and the shutdowns stop.
Phone won't power on after the replacement battery sat in storage
Li-ion cells self-discharge in storage, and if the cell drops below roughly 2.5V the BMS trips into lockout to prevent damage — the phone shows nothing when you press the power button. Connect the charger and leave it for 15–20 minutes without pressing any buttons; the charge IC will trickle current into the cell until voltage clears the BMS re-enable threshold, typically around 2.9V. Once the charging indicator appears on screen, the BMS has reset and normal charging resumes. If no indicator appears after 30 minutes on charge, check the charger output — it must deliver at least 4.75V to initiate recovery on this platform.