About this replacement
Samsung Galaxy Tab A 8.0 2019 — 3.85V Li-Polymer Replacement Battery (SWD-WT-N8)
This 3.85V, 5100mAh Li-Polymer battery replaces the original SWD-WT-N8 cell in the Samsung Galaxy Tab A 8.0 2019. It fits the SM-T290, SM-T295, and SM-T295N models. Install it when the original cell no longer holds a useful charge or the tablet shuts down unexpectedly under normal use.
- SM-T290 and SM-T295 platform: Both the Wi-Fi-only SM-T290 and the LTE SM-T295 share the same battery bay, connector pinout, and charge IC. One replacement cell fits the full range without modification.
- Bench tested on actual hardware: We ran this cell through charge and discharge cycles on SM-T290 and SM-T295 units. The charge IC accepted the cell on first connection, BMS handshake completed without fault codes, and the tablet reached full charge without thermal events.
- Fuel gauge reset after installation: After fitting this cell, run the tablet down to automatic shutoff, then charge it uninterrupted to 100% without using it mid-cycle. That single full cycle resets the fuel gauge IC calibration against the new cell and clears the inaccurate percentage readings that appear after a swap.
Tablet shutting down at 15–25% after battery replacement
The fuel gauge IC carries calibration data from the old cell into the new installation. When display backlight and Wi-Fi or LTE radio draw simultaneously, the combined load causes a brief voltage drop. If the gauge still maps that drop against the old cell's curve, it reads the voltage as critically low and triggers shutdown — even though the new cell has charge remaining. One full discharge to automatic cutoff followed by an uninterrupted charge to 100% realigns the gauge to the new cell's actual voltage curve. After that cycle, shutdowns in the 15–25% range should stop.
Fast charging not available after fitting the new cell
Adaptive fast charge on the Tab A 8.0 2019 requires the charge IC to complete one accepted charge handshake with the new cell before it enables higher current delivery. If you plug in immediately after installation and the percentage display is still unstable, the IC may default to standard 5V charging as a precaution. Let the tablet complete one full charge cycle at the standard rate first. On the next charge after that cycle, fast charge should re-engage automatically — no settings change needed.