About this replacement
AT&T Vista / WTATTRW2 — 3.85V Li-Polymer Replacement Battery (RA001)
This is a 3.85V, 2300mAh (8.86Wh) Li-Polymer battery for the AT&T Vista smartphone (model WTATTRW2). It replaces part number RA001 when the original cell no longer holds a usable charge or fails to power the device. Swap it in when the phone shuts down unexpectedly, drains fast, or won't turn on at all.
- Vista and WTATTRW2 compatibility: Both model identifiers reference the same hardware platform — identical battery bay dimensions (66.50 × 57.40 × 4.30mm), the same 3.85V nominal rail, and the same BMS connector pinout. One cell covers both.
- Bench tested on actual hardware: We cycled this cell through charge and discharge on the Vista platform. The BMS accepted the cell without error flags, and the charge IC completed a full CC/CV cycle without tripping a fault or capping current early.
- Fuel gauge recalibration on first cycle: After installing a new cell, disable fast charging for the first complete discharge-charge cycle. This lets the fuel gauge IC map its coulomb counter against the new cell's discharge curve before high-current charging begins. Skipping this step is the most common cause of erratic percentage readings after a swap.
Sudden shutdown at 20–30% on the replacement cell
This happens when the fuel gauge IC is still calibrated to the old cell's discharge curve. The new cell hits a voltage cliff — a rapid voltage drop under load from the modem or display — before the IC predicts it. The phone's protection circuit reads this as a critically low voltage and forces a shutdown even though the reported percentage looks safe. Run one full discharge down to automatic power-off and then a full uninterrupted charge to reset the coulomb counter baseline.
USB charging not recognised on the first cycle after installation
A new Li-Polymer cell starts with higher internal impedance until it has been through at least one full cycle. Some charge ICs on budget-tier Android hardware interpret the higher impedance as a fault condition and halt the charging handshake before current flows. If the phone shows no charge icon after plugging in, power it off and leave the cable connected for 15 minutes — this allows the charge IC to attempt the handshake against a resting cell. If it still doesn't respond, connect to a 5V/1A standard charger rather than a fast-charge adapter for the first cycle, then switch back once the cell is fully charged.