About this replacement
Hisense HS-EG900 — 3.7V Li-ion Replacement Battery (LI37200)
This is a 3.7V, 2100mAh Li-ion replacement battery for the Hisense HS-EG900 smartphone. It carries OEM part number LI37200 and slots into the same battery bay as the original cell. If your HS-EG900 no longer holds a charge or shuts down unexpectedly, this cell replaces the degraded original.
- HS-EG900 fitment: The LI37200 cell uses the same connector pinout and physical footprint as the factory battery — 51.34 x 50.68 x 6.23mm. The BMS handshake matches the charge IC on the HS-EG900 board, so the phone accepts the cell without throwing charge errors.
- Bench tested on actual hardware: We ran this cell through a full discharge-charge cycle on the HS-EG900 platform. The BMS stayed within normal charge termination voltage, and the fuel gauge IC acknowledged the new cell without lockout or error flags.
- First-cycle fuel gauge reset: After installing this cell, disable fast charging and run one complete discharge down to auto-off, then charge fully to 100%. This gives the fuel gauge IC a clean reference curve for the new cell before it starts tracking coulombs under high-current charging.
Sudden shutdown at 20–30% on the HS-EG900 after a cell swap
This happens because the fuel gauge IC is still using the discharge curve it mapped to the old, degraded cell. When voltage drops under modem or screen load, the cell hits its cutoff floor faster than the gauge predicts — so the phone reads 25% and dies. The fix is one full unconditioned cycle: discharge to auto-off, then charge uninterrupted to 100% with fast charging off. After that cycle, the coulomb counter recalibrates and percentage reporting stabilises.
HS-EG900 not powering on after the replacement cell sat in storage
Li-ion cells self-discharge in storage, and if the LI37200 cell drops below approximately 2.5V per cell, the BMS trips into lockout to prevent damage. The phone will show nothing — no charge screen, no vibration. Connect the phone to a 5V USB charger and leave it for 15–20 minutes without pressing the power button. The charge IC trickle-charges the cell back above the BMS re-enable threshold, typically around 2.8–3.0V, at which point the BMS resets and normal charging resumes.