Hisense CS668 Replacement Battery LI3795bkG 3.7V 1200mAh

Hisense CS668 — 3.7V Li-ion Replacement Battery (LI3795bkG)

This is a 3.7V, 1200mAh Li-ion cell that replaces the original LI3795bkG battery in the Hisense CS668 smartphone. It fits directly into the CS668 battery bay and connects to the same three-pin flex connector as the factory cell. Dimensions are 53.00 × 33.90 × 5.70mm — match these before ordering if your unit has been repaired before.

• CS668 fitment: The CS668 uses a dedicated battery bay sized for this exact cell footprint. The BMS handshake runs through a three-pin connector — voltage, ground, and NTC thermistor. Any cell swap must present the correct impedance on the NTC line or the charge IC will refuse to engage.
• Bench tested on actual hardware: We ran this cell through charge and discharge on CS668-class hardware and confirmed the BMS accepted the cell, the NTC line read within spec, and the charge IC completed a full constant-current/constant-voltage cycle without tripping a fault flag.
• First-use fuel gauge recalibration: After fitting this cell, disable fast charging if your CS668 supports it, then run one full discharge-to-charge cycle at standard rate. This lets the fuel gauge IC map the new cell's discharge curve before it starts logging coulomb counts against an uncalibrated baseline.

Why the CS668 reports wrong battery percentage after a cell swap

The CS668 uses a fuel gauge IC that stores a learned discharge curve from the original cell. When you swap in a new cell, that stored curve no longer matches the actual voltage-to-capacity relationship of the replacement. The gauge keeps reading against the old curve, so the percentage shown on screen can be off by 10–20%. One complete slow discharge from 100% to auto-shutoff, followed by a full charge, forces the IC to re-anchor its coulomb counter to the new cell. After that cycle, percentage accuracy normalises.

Sudden shutdown at 20–30% on the CS668 after replacement

This is a voltage cliff issue, not a capacity fault. Under peak modem or screen load, the cell voltage drops sharply near the lower state-of-charge range — faster than the fuel gauge predicts. The phone's protection circuit reads the voltage dip as a low-battery shutdown threshold being crossed, even though the gauge still shows charge remaining. Let the phone run through two full slow charge-discharge cycles so the fuel gauge IC recalibrates its endpoint voltage. After calibration, shutdowns that were occurring at 25% typically shift down to below 5%.