Archos 50 Titanium 4G AC50TI4G Compatible Battery 3.7V 1800mAh

Archos 50 Titanium 4G — 3.7V Li-ion Replacement Battery (AC50TI4G)

This 3.7V, 1800mAh Li-ion cell is a direct replacement for the Archos 50 Titanium 4G smartphone. It fits both the 50 Titanium 4G and A50 Titanium 4G variants. Swap it in when the original cell no longer holds voltage under screen or modem load.

• 50 Titanium 4G and A50 Titanium 4G compatibility: Both model names refer to the same hardware platform — same connector pinout, same 3.7V nominal rail, same BMS handshake. One cell covers both.
• Bench tested on actual hardware: We cycled this cell through charge and load on the 50 Titanium 4G platform. The BMS accepted the cell without fault flags, and charge termination fired correctly at 4.2V.
• Fuel gauge recalibration on first use: After fitting this cell, disable fast charging and run one full discharge-to-charge cycle at standard rate. The fuel gauge IC on this phone calibrates against the cell's discharge curve — skipping this step leaves the coulomb counter offset against the new cell, which causes erratic percentage readings early on.

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

This is a voltage cliff failure, not a capacity problem. When the cell's internal resistance rises with age, voltage sags sharply under modem transmit bursts or screen-on load — even if the gauge still reads 25%. The phone's power IC interprets the sag as a depleted cell and cuts out to protect the SoC. A fresh 1800mAh cell with low internal resistance holds voltage flat through those load spikes, so the shutdown threshold at around 3.4V is not tripped mid-use.

Phone won't power on after the replacement cell sat in storage

Li-ion cells self-discharge in storage. If this cell dropped below roughly 2.5V per cell, the BMS enters a lockout state to prevent damage — the phone will show nothing when you press the power button. Connect the phone to a wall charger, not a PC port, and leave it for 15–20 minutes before attempting to power on. The charge IC trickle-charges the cell up to the BMS re-enable threshold of around 2.9V, after which normal charging resumes.