T-Mobile One 801E Replacement Battery 3.7V 2300mAh

T-Mobile One 801E (PN07130 / M7) — 3.7V Li-Polymer Replacement Battery

This is a 3.7V, 2300mAh lithium-polymer cell for the T-Mobile HTC One 801E, also listed as PN07130 and M7. It replaces the original internal battery when the existing cell has degraded and can no longer hold a full charge. Dimensions are 89.91 × 59.75 × 2.90mm — measure your original before fitting if you are unsure of the variant.

• One 801E / PN07130 / M7 compatibility: These three model designations share the same physical cell format, voltage rail, and connector pinout. The BMS handshake requirements across all three are identical, so one cell covers the full group.
• Bench tested on actual hardware: We ran this cell through a full charge-discharge cycle on the One 801E platform. The BMS accepted the cell without error flags, and charge termination triggered correctly at 4.2V.
• Fuel gauge recalibration on first use: On first use after installation, disable fast charging and run one complete discharge-charge cycle at standard rate. This lets the fuel gauge IC map the new cell's actual discharge curve before the charge IC pushes higher current into an uncalibrated cell.

Sudden shutdown at 20–30% on the One 801E after a cell swap

This happens because the fuel gauge IC is still running the discharge curve from the old, degraded cell. The new cell's voltage drops faster under modem and display load than the IC expects, so it hits the hardware cutoff before the reported percentage reaches zero. The fix is one full discharge-charge cycle with all background sync and screen brightness at normal levels — this forces the coulomb counter to re-anchor its endpoints. After that cycle, shutdowns at 20–30% stop on their own.

Phone warm near the battery area during the first few charges

A fresh high-impedance cell generates more heat during the first charge cycles than a worn cell does. The charge IC is pushing current into a cell with slightly higher internal resistance until it conditions down after a few cycles. This is normal and not a sign of a faulty cell. If the device stays warm past the third full charge, check that no third-party app is holding the CPU at full load during charging.