Samsung SGH-i710 AB653450CC Replacement Battery 3.7V 1200mAh

Samsung SGH-i710 / SGH-i718 — 3.7V Li-ion Replacement Battery (AB653450CC)

This is a 3.7V, 1200mAh Li-ion cell built to the AB653450CC spec. It fits the Samsung SGH-i710 and SGH-i718 smartphones. Swap it in when the original cell no longer holds voltage through a normal day of calls and screen-on use.

• SGH-i710 and SGH-i718 fit: Both models run the same 3.7V single-cell architecture with identical connector pinout and BMS handshake protocol. The AB653450CC cell dimensions — 50.69 × 36.84 × 6.41mm — match the battery bay on both without modification.
• Bench tested on actual hardware: We cycled this cell through charge and discharge on the SGH-i710 platform. The BMS accepted the cell without triggering an overcurrent fault, and the charge IC brought it to full termination voltage at 4.2V as expected.
• Fuel gauge recalibration on first use: After fitting this cell, run one complete discharge-to-charge cycle with fast charging disabled. The SGH-i710 fuel gauge IC calibrates its coulomb counter against the new cell's discharge curve on that first pass — skipping it leads to inaccurate percentage readings from day one.

Sudden shutdown at 20–30% on the SGH-i710 after a cell swap

This is a voltage cliff problem, not a capacity problem. When the GSM modem transmits or the screen ramps to full brightness, current draw spikes sharply. A new cell with an uncalibrated fuel gauge can read 25% while the actual resting voltage is already close to the BMS low-voltage cutoff threshold. The phone shuts down to protect the cell even though the percentage display suggests charge remains. One full calibration cycle — full discharge, then full charge — maps the new cell's voltage curve to the fuel gauge IC and moves the shutdown point to where it belongs.

Phone warm near the battery compartment during first charge

A fresh AB653450CC cell arrives with slightly elevated internal impedance compared to a fully conditioned cell. On the first charge cycle, the charge IC pushes current into that higher impedance, and the energy difference dissipates as heat in the cell and the charge IC on the board. This is expected behaviour on cycle one and not a fault. By the second full charge cycle, internal impedance drops and the warmth reduces. If the compartment remains hot after three full cycles, check that the battery contacts on the phone are clean and making full contact.