Archos 45c Platinum Replacement Battery 3.7V 1450mAh

Archos 45c Platinum — 3.7V Li-ion Replacement Battery (AC45CPL)

This 3.7V Li-ion cell at 1450mAh (5.37Wh) replaces the original battery in the Archos 45c Platinum and 45c Platinum 6. It fits both variants using OEM part numbers AC45CPL and AL45CPL. Install it when the original cell can no longer hold enough charge for daily use.

• 45c Platinum and 45c Platinum 6 compatibility: Both models share the same battery bay dimensions, connector pinout, and BMS handshake protocol, which is why a single cell — 62.00 × 56.95 × 4.40mm — covers both variants without any modification.
• Bench tested on actual hardware: We cycled this cell through charge and discharge on the 45c Platinum platform. The BMS accepted the cell on first connection, thermal readings stayed within normal range throughout charging, and the protection circuit tripped correctly at low-voltage threshold.
• Fuel gauge recalibration on first use: After fitting this cell, disable fast charging and run one full discharge-to-charge cycle before normal use. This lets the fuel gauge IC map its coulomb counter against the new cell's actual discharge curve before high-current charging begins against an uncalibrated baseline.

Why the Archos 45c Platinum reports wrong battery percentage after a cell swap

The fuel gauge IC stores a learned discharge curve from the original cell. When a new cell goes in, that stored curve no longer matches actual cell behaviour, so the percentage display drifts. The IC needs at least one full discharge and charge cycle to recalibrate its coulomb counter against the new cell. Charge to 100%, let it drain to automatic shutdown, then charge back to 100% without interruption. After that single cycle, percentage reporting should track accurately.

Sudden shutdown at 20–30% on the replacement cell

This happens when the modem radio or display backlight draws a short current spike that drops cell voltage below the BMS cutoff threshold — even though the reported percentage looks safe. A new cell operating on an uncalibrated fuel gauge curve is most vulnerable during that first week. The fix is the same recalibration cycle above: one uninterrupted discharge to shutdown, then a full charge. Once the gauge IC has a real discharge curve to reference, it compensates for load-spike voltage sag and the shutdowns stop.