About this replacement
Lenovo A208t / A269 Series — 3.7V Li-ion Replacement Battery (BL214 / BL203)
This is a 3.7V, 1600mAh Li-ion replacement cell for the Lenovo A208t, A269, A305e, A218t, and eight additional models sharing the BL214 or BL203 battery. It fits the same connector and footprint as the factory cell. Swap it in when the original no longer holds a charge or the phone fails to power on.
- A208t / A269 platform fit: These models share the same 3.7V single-cell architecture and BL214/BL203 connector pinout. The BMS handshake expects the same NTC thermistor line present in this cell — no adapter or modification needed.
- Bench tested on actual hardware: We cycled this cell through charge and discharge on a compatible A269 unit. The BMS accepted the cell without fault codes, and the charge IC held the correct 4.2V cutoff at end of charge.
- Fuel gauge recalibration after install: After fitting this cell, run one complete discharge to auto-shutdown, then charge to 100% without interruption. The phone's fuel gauge IC maps its coulomb counter to the new cell's discharge curve during that first full cycle — skip it and the percentage readout will drift.
Why the A208t reports wrong battery percentage after a cell swap
The A208t uses a fuel gauge IC that stores a learned discharge curve from the old cell. When a new cell goes in, the IC is still reading against the previous cell's profile. The mismatch causes the displayed percentage to jump, stall, or read 100% while the phone is still charging. One full discharge-charge cycle forces the IC to rebuild its reference curve against the new cell. After that cycle, percentage reporting stabilises.
Sudden shutdown at 20–30% on the replacement cell
This happens when the modem or screen draws a current spike the fuel gauge hasn't yet mapped correctly. The cell voltage drops sharply under load — hitting the BMS undervoltage cutoff — even though the displayed percentage looks safe. The root cause is an uncalibrated coulomb counter, not a faulty cell. Complete the first full discharge-charge cycle, and confirm the resting voltage reads at least 3.75V before the next session.