K-Touch Touch 3 Replacement Battery TBT5957 3.8V 2200mAh

K-Touch Touch 3 / Touch 3C / Touch 5 — 3.8V Li-ion Replacement Battery (TBT5957)

This is a 3.8V Li-ion cell rated at 2200mAh (8.36Wh), built to the TBT5957 specification. It fits the K-Touch Touch 3, Touch 3C, and Touch 5 smartphones. If your original battery no longer holds a charge or the phone shuts down unexpectedly, this cell replaces it directly.

• Touch 3, Touch 3C, and Touch 5 compatibility: All three models share the same battery bay dimensions (72.00 × 57.06 × 4.36mm), connector pinout, and 3.8V nominal voltage rail — which is why a single cell covers the full lineup without modification.
• Bench tested on actual hardware: We cycled this cell through charge and discharge on a controlled rig and confirmed the BMS communicates correctly with the charge IC — no false full-charge flags, no premature cutoff at the low end.
• Fuel gauge recalibration on first use: On first installation, disable fast charging and run one complete discharge-to-charge cycle. The fuel gauge IC is calibrated against the old cell's discharge curve; giving it one full cycle with the new cell prevents erratic percentage readings from the start.

Sudden shutdown at 20–30% on the K-Touch Touch 3

This is a voltage cliff failure, not a capacity problem. As lithium-ion cells age, their internal resistance rises. Under load — a 4G modem handshake or a screen-on burst — terminal voltage drops sharply below the BMS cutoff threshold even when the fuel gauge still reads 20–30%. The phone cuts power to protect the cell before the percentage counter reaches zero. A fresh TBT5957 cell with lower internal resistance sustains voltage under the same load, so the cutoff only triggers at a true low state of charge.

Phone reporting wrong battery percentage after a cell swap

The Android fuel gauge IC uses a coulomb counter model trained on the previous cell's capacity and discharge curve. After installing a new cell, that model is still mapped to the old battery — so percentage readings can jump, stall, or hit 0% early. The fix is straightforward: charge the phone to 100%, let it discharge fully until it shuts off on its own, then charge back to 100% without interruption. After that single full cycle, the coulomb counter resets its baseline to the new cell and percentage accuracy normalises.