Explay 4GAME Compatible Battery 3.7V 2000mAh Li-ion

Explay 4GAME — 3.7V Li-ion Replacement Battery

This is a 3.7V, 2000mAh Li-ion replacement battery for the Explay 4GAME handheld gaming console. It fits the 4GAME directly and restores power when the original cell has degraded or stopped holding a charge. Capacity is rated at 7.4Wh, matching the stock specification for this device.

• Explay 4GAME fitment: The 4GAME uses a slim Li-ion cell measuring 70.05 × 59.95 × 4.31mm. The connector pinout and BMS communication line match what the 4GAME's charge IC expects — no adapter or modification needed.
• Bench tested on actual hardware: We cycled this cell through charge and discharge on the bench. The BMS held a stable cutoff voltage and the charge IC accepted the cell without triggering fault flags on the protection circuit.
• Fuel gauge recalibration after swap: On first use after installation, disable fast charging if available and run one full discharge-to-charge cycle. This gives the fuel gauge IC time to map its coulomb counter against the new cell's discharge curve before any high-current charging begins.

Sudden shutdown at 20–30% on the Explay 4GAME after a cell swap

This is a fuel gauge calibration problem, not a faulty cell. The 4GAME's fuel gauge IC was trained on the original cell's voltage-discharge curve. A new cell has a slightly different curve, so the IC misjudges the remaining capacity and cuts power before the cell is actually empty. One full discharge cycle — run the device until it shuts off automatically, then charge to 100% without interruption — forces the coulomb counter to re-anchor to the new cell. After that cycle, shutdowns at 20–30% should stop.

Explay 4GAME not powering on after the replacement battery sat in storage

Li-ion cells self-discharge in storage. If this battery was stored for an extended period before installation, its resting voltage may have dropped below 2.5V per cell — the threshold where the BMS engages a lockout to prevent damage. The device will show no response: no boot screen, no charging indicator. Connect the 4GAME to a charger and leave it undisturbed for 20–40 minutes; the charge IC applies a low trickle current to bring the cell back above the BMS unlock threshold, typically around 3.0V, at which point normal charging resumes.