Samsung Galaxy Note GH43-03640B Replacement Battery 3.7V 2500mAh

Samsung Galaxy Note / GT-N7000 / GT-I9220 — 3.7V Li-ion Replacement Battery (GH43-03640B)

This is a 3.7V, 2500mAh Li-ion replacement battery for the Samsung Galaxy Note series, including the GT-N7000, GT-I9220, and SGH-i717. OEM part number GH43-03640B. It fits the original battery slot and connects to the same three-contact BMS interface as the factory cell.

• GT-N7000, GT-I9220, SGH-i717 and related variants: These models share the same 3.7V cell format, identical connector pinout, and the same BMS communication protocol over the third contact line — so one cell covers the full variant group without modification.
• Bench tested on actual hardware: We cycled this cell on a GT-N7000 unit and confirmed the BMS accepted the cell on first insertion, passed the charge IC handshake, and reached full charge termination without fault flags. Discharge curve held flat through the mid-range before dropping at the expected low-voltage knee.
• Fuel gauge recalibration on first cycle: After installing this cell, disable fast charging and run one full discharge down to auto-shutdown, then charge to 100% uninterrupted. The fuel gauge IC on these Note units calibrates its coulomb counter against the real discharge curve on that first cycle — skipping it causes erratic percentage readings for weeks.

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

This happens because the fuel gauge IC still holds the discharge curve of the old, degraded cell in memory. The new cell has a steeper voltage cliff under load — particularly when the modem, screen, and GPS draw current simultaneously — and the voltage drops below the shutdown threshold before the percentage counter catches up. The phone cuts power even though the reported charge level looks fine. One complete discharge-charge cycle rewrites the coulomb counter baseline and eliminates the premature cutoff.

Phone won't power on after the replacement battery sat in storage

Li-ion cells self-discharge during storage, and if the cell dropped below roughly 2.5V per cell, the BMS enters a lockout state to prevent damage — the phone will show nothing on screen, no charge indicator, no vibration. Connect the phone to a wall charger (not a USB port) and leave it untouched for 20–30 minutes. The charge IC trickle-charges the cell at low current to bring voltage above the BMS re-enable threshold, typically around 2.9V, before normal charging resumes.