GLH-H02 Gigabyte gSmart i Replacement Battery 3.7V 1600mAh

Gigabyte gSmart i — 3.7V Li-ion Replacement Battery (GLH-H02)

This is a 3.7V, 1600mAh Li-ion cell for the Gigabyte gSmart i and gSmart i (128) smartphones. It replaces OEM part numbers GLH-H02 and A2K40-EBR280-C0R. Swap it in when the original cell can no longer hold a working charge through a normal day of calls, messaging, and light app use.

• gSmart i and gSmart i (128) fitment: Both handsets share the same battery bay dimensions, voltage rail, and connector pinout — one cell covers both. The BMS handshake runs at 3.7V nominal, and this cell matches that spec exactly.
• Bench tested on actual hardware: We cycled the cell through charge and discharge on the bench. The BMS accepted the charge current without tripping, held voltage above 3.5V through the mid-discharge range, and cut off cleanly at the low-voltage threshold.
• Fuel gauge recalibration on first use: After fitting this cell, disable fast charging if your handset supports it, then run one full discharge down to auto-off followed by a complete charge to 100%. This gives the fuel gauge IC a clean reference curve for the new cell before it starts tracking coulombs against an uncalibrated baseline.

Why the gSmart i reports wrong battery percentage after a cell swap

The fuel gauge IC on the gSmart i stores a discharge curve learned from the original cell. When you install a new cell, that stored curve no longer matches actual cell behaviour. The gauge reads voltage and estimates charge state against the old data, which produces percentage jumps or an offset reading. One full discharge-to-cutoff and recharge cycle forces the IC to write a new curve against the replacement cell.

Sudden shutdown at 20–30% on the replacement cell

This happens when the modem or display pulls a current spike that drops cell voltage below the BMS cutoff threshold — even though the gauge still shows charge remaining. A new cell with an uncalibrated gauge is most vulnerable to this in the first few cycles. The fix is completing that first full discharge cycle so the gauge learns where the actual voltage cliff sits for this cell. If shutdowns continue past three full cycles, check that the battery connector is fully seated — a partial connection raises contact resistance and amplifies voltage sag under load.