About this replacement
Samsung SCH-R510 — 3.7V Li-ion Replacement Battery (AB503442CA)
This is a 3.7V, 1300mAh Li-ion battery for the Samsung SCH-R510 smartphone. It replaces OEM part numbers AB503442CA and AB503442BABSTD. Fit the battery, reassemble, and power on — no tools beyond a fingernail or spudger needed for most SCH-R510 back covers.
- SCH-R510 cell fit: The SCH-R510 uses a single-cell 3.7V Li-ion pack with a three-pin connector carrying power, ground, and a thermistor line. The BMS reads that thermistor to gate charging current — any replacement must match the original cell dimensions and connector pinout exactly, which AB503442CA does.
- Bench tested on actual hardware: We cycled this cell through charge and discharge on the SCH-R510 platform. The BMS accepted the cell on first connection, charge termination triggered correctly at 4.2V, and the protection circuit tripped as expected at the low-voltage cutoff threshold.
- Fuel gauge recalibration after swap: On first use, disable fast charging if your carrier version supports it, then run one full discharge-to-charge cycle. This lets the fuel gauge IC recalibrate its coulomb counter against the new cell's actual discharge curve before it starts reporting accurate percentages.
Why the SCH-R510 reports wrong battery percentage after a cell swap
The SCH-R510 uses a fuel gauge IC that builds a model of the installed cell's discharge curve over time. When you install a new cell, that stored model no longer matches the physical cell — so the reported percentage drifts from the actual state of charge. The fix is one full discharge from 100% down to auto-shutdown, followed by an uninterrupted charge back to 100%. After that single cycle the coulomb counter resets against real data from the new cell, and percentage accuracy stabilises.
Sudden shutdown at 20–30% on the replacement cell
This happens when the fuel gauge IC is still calibrated to the old cell's discharge curve, which typically had a steeper voltage drop near end of charge. The new cell hits a voltage threshold the IC interprets as critically low, and the phone shuts down before the gauge catches up. It is not a faulty battery — it is a calibration lag. Run two full discharge-charge cycles and the shutdowns should stop. If they persist past two cycles, check that resting cell voltage is above 3.6V with a multimeter; anything below 3.4V at rest signals a deeper cell issue.