Wexler E6002 Compatible Battery 3.7V 1500mAh

Wexler E6002 — 3.7V Li-ion Replacement Battery

This is a 3.7V Li-ion cell rated at 1500mAh (5.55Wh), built to fit the Wexler E6002 smartphone. It replaces the original cell when the phone no longer holds a useful charge, shuts down unexpectedly, or fails to power on. Dimensions are 65.80 × 43.90 × 5.10mm — verify against your existing cell before fitting.

• E6002 fit: The E6002 uses a standard removable Li-ion cell at 3.7V nominal. The connector pinout and physical footprint match this cell directly — no adapter or modification needed.
• Bench tested on actual hardware: We cycled this cell through a full discharge and charge sequence, monitoring BMS cutoff thresholds at both ends. The protection circuit tripped correctly at low voltage and accepted charge current without fault flags.
• Fuel gauge recalibration on first use: After installing a new cell, disable fast charging for the first complete discharge-to-charge cycle. The E6002's fuel gauge IC reads the new cell's discharge curve during this cycle — skipping it lets the IC push current into an uncalibrated cell and produces inaccurate percentage readings from the start.

Sudden shutdown at 20–30% on the E6002 after a cell swap

This is a voltage cliff issue, not a capacity problem. The new cell's discharge curve differs from the worn cell the fuel gauge IC was calibrated to. Under modem or screen load, the actual cell voltage drops below the shutdown threshold before the reported percentage reaches zero. One full discharge cycle — run the phone until it shuts itself off, then charge to 100% uninterrupted — lets the coulomb counter reset against the new cell's actual curve. After that cycle, shutdowns at 20–30% typically stop.

Phone shows wrong battery percentage after replacement

The E6002's fuel gauge IC stores a learned model of the old cell's impedance and discharge slope. A new cell has different characteristics, so the IC reports stale data — often reading high early and dropping fast near the end. This corrects itself after one full calibration cycle: discharge the phone completely until it powers off on its own, then charge to 100% without interruption. Do not unplug early. After the cycle completes, the IC recalculates against the new cell and percentage reporting stabilises.