Archos 50 Platinum 4G Compatible Battery 3.8V 1500mAh

Archos 50 Platinum 4G — 3.8V Li-ion Replacement Battery (AC50PL4G)

This 3.8V, 1500mAh Li-ion cell replaces the original battery in the Archos 50 Platinum 4G smartphone. It fits the OEM battery bay directly and matches the stock connector and BMS communication protocol. Capacity is 1500mAh (5.7Wh) — identical to the factory specification.

• Archos 50 Platinum 4G fit: This cell matches the physical footprint (71.92 x 57.94 x 4.24mm) and the 3.8V nominal voltage rail the Archos 50 Platinum 4G power management IC expects. A mismatched voltage rail causes the PMIC to reject the cell entirely, so the match here matters.
• Bench tested on actual hardware: We cycled this cell through a full discharge-charge sequence and confirmed the BMS handshake completes correctly — the phone recognises the battery, accepts charge current, and reports state-of-charge without error flags on boot.
• Fuel gauge recalibration on first use: On first use after installation, disable fast charging for one complete discharge-charge cycle. This lets the fuel gauge IC map the new cell's discharge curve before high-current charging pushes current into an uncalibrated cell — skipping this step causes the percentage display to jump erratically in early use.

Sudden shutdown at 20–30% on the Archos 50 Platinum 4G

Li-ion cells have a steep voltage cliff near end-of-discharge. When the modem fires a transmission burst or the screen peaks at full brightness, current draw spikes hard. If the cell voltage drops below roughly 3.2V under that load, the PMIC trips a hard shutdown even though the fuel gauge still reads 20–30%. A new cell with full capacity holds voltage under load far better than a degraded original, which is why this symptom typically clears after a replacement and one full recalibration cycle.

OS reporting wrong battery percentage after cell swap

The Archos 50 Platinum 4G uses a fuel gauge IC that tracks charge state using a coulomb counter calibrated to the original cell's discharge curve. Swap in a new cell and that learned curve no longer matches, so the reported percentage drifts — often reading 100% and then jumping to 60% within minutes. The fix is one full discharge cycle from 100% down to automatic shutdown, followed by an uninterrupted charge to 100%. After that single cycle, the fuel gauge IC locks onto the new cell's curve and percentage readings stabilise.