Archos 50b Platinum AC50BPL Replacement Battery 3.7V 1900mAh

Archos 50b Platinum — 3.7V Li-ion Replacement Battery (AC50BPL)

This is a 3.7V, 1900mAh Li-ion cell for the Archos 50b Platinum smartphone. It replaces the original battery when capacity has dropped or the cell no longer holds a charge. Fits the 50b Platinum directly using OEM part references AC50BPL, AL50BPL, AC50BL, and AC50BLP.

• Archos 50b Platinum compatibility: The 50b Platinum uses a fixed 3.7V single-cell Li-ion architecture with a direct connector that matches this cell. The BMS handshake on this device does not require proprietary authentication — the replacement cell communicates charge state through the standard fuel gauge IC without additional pairing steps.
• Bench tested on actual hardware: We ran this cell through charge and discharge cycles on the 50b Platinum platform. The BMS accepted the cell without triggering over-voltage cutoff on charge, and the fuel gauge IC tracked state-of-charge across the full discharge curve without error flags.
• First-cycle fuel gauge recalibration: On first installation, disable fast charging and run one complete discharge-to-charge cycle. The fuel gauge IC on the 50b Platinum calibrates against the cell's discharge curve — doing this before high-current charging prevents the IC from mapping current into an uncalibrated curve.

Why the 50b Platinum reports wrong battery percentage after a cell swap

The 50b Platinum stores the discharge curve of the old cell inside its fuel gauge IC. When a new cell goes in, the IC is still referencing that old curve, so the percentage reading drifts from actual charge state. This shows up as the phone jumping from 40% to 5% with no warning, or sitting at 100% well past a full charge. One complete discharge cycle — down to automatic shutdown — followed by an uninterrupted charge to full resets the coulomb counter against the new cell's actual curve. After that cycle, percentage accuracy stabilises.

Sudden shutdown at 20–30% on the replacement cell

This happens when the cell voltage drops sharply under load — typically during modem activity, screen-on bursts, or simultaneous background sync. The 50b Platinum's power IC cuts the device when terminal voltage falls below roughly 3.2V, which can happen at 25% reported charge if the fuel gauge IC has not yet recalibrated. The fix is to complete the first-cycle recalibration described above. Once the IC has mapped the new cell's voltage-to-capacity curve, the shutdown threshold triggers at the correct low-charge point rather than mid-use.