Sprint LS970 BL-T5 Replacement Battery 3.8V 2100mAh

Sprint LS970 — 3.8V Li-Polymer Replacement Battery

This 3.8V, 2100mAh lithium-polymer cell replaces the original BL-T5 battery in the Sprint LG G2 (LS970). It fits the LS970's battery bay directly, matching the original connector orientation and contact layout. Capacity is 2100mAh at 7.98Wh — identical to the factory specification.

• LS970 fitment: The LS970 uses a fixed-contact, recessed bay with a three-pad connector aligned to the BMS on the cell. This replacement matches that pad spacing and tab geometry, so the charge IC sees a valid cell on first power-up.
• Bench tested on actual hardware: We cycled this cell on an LS970 test unit and confirmed the BMS handshake completes within the first 60 seconds of connection. The charge IC moved through trickle, CC, and CV phases without error flags.
• Fuel gauge recalibration on first cycle: On first use after installation, disable fast charging and run one full discharge-to-charge cycle at standard current. The LS970's fuel gauge IC calibrates its coulomb counter against the new cell's discharge curve — skipping this step leaves the percentage reading untrustworthy for several days.

Sudden shutdown at 20–30% on a fresh cell

The LS970 shuts down mid-use — not at zero percent — because the modem radio and display together pull current spikes the cell voltage can't sustain. When voltage sags below the BMS cutoff threshold under that combined load, the phone cuts power to protect the cell. This happens most often during a call with the screen on, or when LTE signal is weak and the modem is transmitting at full power. After one full discharge-charge calibration cycle, the fuel gauge IC maps the actual voltage cliff and adjusts the low-battery warning to trigger earlier.

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

Li-polymer cells self-discharge during storage. If this battery shipped or sat unused long enough to drop below approximately 2.5V per cell, the BMS enters lockout mode and blocks current flow entirely. The LS970 will show nothing on screen — no boot logo, no charge indicator. Connect to a known-good charger and leave it untouched for 20–30 minutes; the charge IC runs a trickle-charge recovery sequence that brings the cell back above the BMS threshold. Once voltage recovers past roughly 3.0V, the phone will display the charging icon and boot normally.