Aspera R6 Replacement Battery 3.7V 3200mAh Li-Polymer

Aspera R6 — 3.7V Li-Polymer Replacement Battery (R6 / QX1508012381)

This 3.7V, 3200mAh lithium-polymer battery is a direct cell replacement for the Aspera R6 smartphone. It fits the R6's internal battery bay and connects to the device's charge management circuit via the original flex connector. Capacity is rated at 11.84Wh.

• Aspera R6 fitment: The R6 uses a sealed Li-Polymer pouch cell at 3.7V nominal. This replacement matches the original cell's voltage rail and physical footprint — 63.30 × 56.00 × 7.00mm — so the BMS handshake and charge IC communication carry over without modification.
• Bench tested on actual hardware: We cycled this cell through charge and load on a test rig matching the R6's charge IC current profile. The BMS held cutoff correctly at both ends of the voltage window, and the protection circuit tripped cleanly under simulated over-current conditions.
• First-cycle fuel gauge reset: On first use after installation, disable fast charging and run one complete discharge-to-charge cycle. This lets the fuel gauge IC map its coulomb counter against the new cell's actual discharge curve before high-current charging starts pushing into an uncalibrated state.

Sudden shutdown at 20–30% on the replacement cell

After a cell swap, the R6's fuel gauge IC still holds calibration data from the old degraded cell. When the new cell hits roughly 3.55–3.60V under modem or screen load, the voltage drop can exceed what the IC expects at that reported percentage, triggering a protection cutoff. The phone reads 25% but the cell is already near its loaded floor. One full discharge cycle — down to automatic shutdown, then a full uninterrupted charge — forces the coulomb counter to re-anchor to the new cell's actual capacity. After that cycle, percentage reporting stabilises.

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

Li-Polymer cells self-discharge at roughly 2–3% per month. If this battery spent extended time in a warehouse or in your drawer, the cell voltage may have dropped below 3.0V — the point where the BMS locks out to prevent permanent anode damage. The phone sees no voltage at the PMIC and won't boot. Connect the original charger and leave it for 20–30 minutes without pressing the power button; the charge IC trickle-charges the cell back above the BMS re-enable threshold, typically around 3.0V per cell, before switching to normal charge current.