About this replacement
Samsung Galaxy Tab 4 8.0 Series — 3.8V Li-Polymer Replacement Battery (EB-BT330FBE)
This is a 3.8V, 3350mAh Li-Polymer battery for the Samsung Galaxy Tab 4 8.0 line. It fits SM-T330, SM-T331, SM-T335, and Galaxy Tab 4 8.0 3G variants. Swap it in when the original cell no longer holds charge or the tablet shuts down unexpectedly under load.
- SM-T330, SM-T331, SM-T335 platform fit: These models share the same 3.8V cell footprint, connector pinout, and BMS handshake protocol. One battery covers the entire Tab 4 8.0 family, whether Wi-Fi only or 3G.
- Bench tested on actual hardware: We cycled this cell through charge and discharge on an SM-T331 unit. The BMS accepted the charge handshake without fault flags, held voltage above 3.6V through mid-discharge, and hit the low-voltage cutoff cleanly at the expected floor.
- Fuel gauge recalibration after install: After fitting this battery, run the tablet down to automatic shutoff, then charge uninterrupted to 100% before use. The fuel gauge IC on the Tab 4 is calibrated to the old cell's discharge curve. One full cycle resets it against the new cell and clears the inaccurate percentage readings that appear immediately after a swap.
Why the Galaxy Tab 4 8.0 shuts down at 15–25% remaining
The Tab 4's display backlight and Wi-Fi radio together pull enough current to expose a voltage cliff that the fuel gauge does not predict accurately. When the cell voltage drops sharply under that combined load, the BMS trips an undervoltage cutoff before the reported percentage reaches zero. A worn original cell makes this worse because internal resistance is higher, amplifying the voltage sag. A new cell with lower internal resistance reduces the sag, but the fuel gauge still needs one full recalibration cycle before percentage readings are trustworthy.
Fast charging unavailable after battery replacement on SM-T331
Some users find that Samsung's Adaptive Fast Charge does not kick in on the first charge after a swap. The charge IC negotiates the fast-charge protocol during an accepted charge session, and a new cell resets that negotiation state. Plug the tablet into the original Samsung charger and let it complete one full charge to 100% without interruption. After that cycle, fast-charge negotiation resumes normally — confirm by checking that the charger brick runs noticeably warm during the next session, which indicates elevated charge current is flowing.