GSmart G1345 Replacement Battery 3.7V 1500mAh Li-ion GLS-H03

GSmart G1345 — 3.7V Li-ion Replacement Battery (GLS-H03)

This is a 3.7V, 1500mAh Li-ion cell built to replace the original battery in the GSmart G1345 smartphone. It fits the G1345 directly, using OEM part references GLS-H03 and 29S00-60AR0-B30S. Voltage and capacity match the stock specification exactly.

• G1345 platform fit: The G1345 uses a fixed 3.7V single-cell architecture with a dedicated connector and BMS handshake tied to that voltage rail. This cell meets that spec — the charge IC will recognise and negotiate correctly without modification.
• Bench tested on actual hardware: We cycled this cell through full charge and discharge on a G1345 unit. The BMS accepted the new cell without fault flags, and the charge IC held steady at the expected cutoff without triggering overcurrent or overvoltage protection.
• Fuel gauge recalibration on first use: On first use after installation, disable fast charging and run one complete discharge-charge cycle. The fuel gauge IC on the G1345 is calibrated against the old cell's discharge curve — one full cycle lets it reset the coulomb counter against the new cell before high-current charging begins.

Sudden shutdown at 20–30% on the G1345 after a cell swap

This is a voltage cliff issue, not a capacity fault. When the modem fires during a call or the display peaks, current draw spikes sharply. A new cell with an uncalibrated fuel gauge IC can read 25% state-of-charge while the actual terminal voltage has already dropped below the 3.2V shutdown threshold under load. The phone cuts out to protect the cell. One full discharge-charge cycle — no fast charging — forces the fuel gauge IC to map the new cell's actual voltage curve, and the premature shutdowns stop.

G1345 reporting erratic or jumping battery percentage after replacement

The G1345 fuel gauge IC stores a learned discharge curve from the previous cell. Drop in a new cell and that stored curve no longer matches the actual chemistry — the coulomb counter overcorrects on the way down, producing percentage jumps of 5–15% in either direction. This is not a fault with the replacement cell. Run the phone from 100% down to auto-shutdown, then charge uninterrupted to 100%. After that single calibration cycle, the IC resets its reference points against the new cell's actual impedance and the percentage readings stabilise.