Tongfang GM7MG7P Laptop Compatible Battery 11.55V 7800mAh

Tongfang GM7MG7P / GM7MPHP — 11.55V Li-Polymer Replacement Battery

This is an 11.55V, 7800mAh (90.09Wh) lithium-polymer battery for the Tongfang GM7MG7P and GM7MPHP notebooks. It replaces the original factory cell when capacity has dropped or the pack no longer holds a charge. No OEM part number is published for this cell — fitment is confirmed by model number and connector pinout.

• GM7MG7P and GM7MPHP compatibility: Both models share the same battery bay dimensions, connector layout, and BMS handshake protocol. The 11.55V three-cell Li-Polymer configuration is common across this chassis generation, which is why a single cell covers both variants.
• Bench tested on actual hardware: We cycled this cell through charge, full discharge to hibernate cutoff, and a second full charge. The BMS reported healthy cell voltage across all three groups, and the protection circuit triggered correctly at low-voltage threshold without a hard crash.
• Post-install calibration for accurate fuel gauge readings: After fitting, run one full discharge until the laptop enters hibernate, then charge uninterrupted to 100%. This forces the BIOS battery learn cycle to reset against the new cell data and clears the inaccurate health warning that appears on first boot after every cell swap.

Why the GM7MG7P BIOS reports battery health as poor immediately after a cell swap

The BIOS reads health data from the battery's EEPROM, which stores cycle count and rated capacity from the previous cell. When a new cell is installed, that EEPROM data does not automatically reset — the system compares the fresh cell's output against stale historical values and flags it as degraded. This is a firmware read issue, not a fault with the replacement cell. Running one full discharge-to-hibernate followed by an uninterrupted charge to 100% triggers the learn cycle and overwrites the old EEPROM reference. After one or two full cycles, the BIOS health indicator will update to reflect the actual cell condition.

Laptop shutting down at 20–30% remaining shown on the fuel gauge

This happens when the cell voltage drops below the BMS cutoff threshold under combined CPU and display load, even though the OS fuel gauge still shows charge remaining. The fuel gauge IC was calibrated to the old cell's discharge curve and hasn't yet mapped the new one. The percentage reading and the actual cell voltage fall out of sync, so the system shuts down at what looks like 25% but is actually near 3.0V per cell group. Complete two full discharge-to-hibernate and recharge cycles — this recalibrates the fuel gauge IC against the new cell and corrects the cutoff point.