Total Wireless A2X Replacement Battery 3.85V 3300mAh

Total Wireless A2X / A508DL — 3.85V Li-Polymer Replacement Battery

This is a 3300mAh, 3.85V Li-Polymer battery for the Total Wireless A2X and A508DL smartphones. It replaces a worn or dead original cell that no longer holds charge through a normal day. Capacity figures come from our product data: 3300mAh / 12.71Wh.

• A2X and A508DL shared platform: Both models run the same battery bay dimensions — 80.20 × 60.60 × 4.10mm — and use the same connector pinout and BMS handshake voltage, so one cell covers both variants without modification.
• Bench tested on actual hardware: We cycled this cell through charge and discharge on the A508DL platform. The BMS accepted a standard charge cycle without overcurrent flags, and cell voltage at full charge held steady at 4.35V before tapering.
• Fuel gauge recalibration on first use: On first use after installation, disable fast charging and run one full discharge-to-charge cycle. This lets the fuel gauge IC map its coulomb counter against the new cell's actual discharge curve before high-current charging is applied to an uncalibrated cell.

Sudden shutdown at 20–30% on the replacement cell

A new Li-Polymer cell has a steeper voltage cliff than a broken-in cell. When the modem fires a transmission burst or the screen peaks brightness, current draw spikes and cell voltage drops sharply below the BMS cutoff threshold — even though the OS reported 20–30% remaining. The fuel gauge IC is still calibrated to the old cell's curve, so the percentage shown does not match the new cell's actual state of charge. One full slow-charge cycle from 0% to 100% resets the coulomb counter and pushes the cutoff event to a much lower reported percentage.

Phone warm near the battery during first few charges

A fresh Li-Polymer cell starts with slightly higher internal impedance than a cycled one. The charge IC pushes current into that resistance, and the resulting heat is normal for the first two to three cycles. If surface temperature stays below 40°C and drops after the first full cycle, nothing is wrong. If the phone stays hot past the third charge or shows a thermal warning, check that the battery connector is fully seated — a half-seated connector forces the IC to compensate with higher voltage, which generates additional heat.