About this replacement
Samsung Galaxy Tab A7 Lite — 3.85V Li-Polymer Replacement Battery (HQ-3565N)
This 3.85V, 4900mAh Li-Polymer battery is a direct replacement for the Samsung Galaxy Tab A7 Lite, including SM-T225N and SM-T225C variants. It fits the 8.7-inch 2021 tablet lineup that shares the HQ-3565N cell specification. Install it when the original cell no longer holds charge through a normal day of use.
- SM-T220 and SM-T225 series fit: Samsung uses the same 117.40 × 97.00 × 2.80mm cell across the Wi-Fi and LTE variants of the A7 Lite. The connector pinout and BMS handshake protocol are identical across that range, so this cell covers both without modification.
- Bench tested on actual hardware: We ran this cell through charge and discharge cycles on an SM-T225. The BMS accepted the new cell on first connection, reported state-of-charge within a normal range, and thermal readings stayed within Samsung's spec throughout the charge cycle.
- Fuel gauge recalibration after swap: After fitting this battery, run the tablet down to automatic shutoff, then charge uninterrupted to 100% without using the device. This gives the fuel gauge IC a full reference curve against the new cell and corrects the inaccurate percentage readings that appear immediately after a swap.
Why the Tab A7 Lite shuts down at 15–25% remaining
The Galaxy Tab A7 Lite drives a backlit 8.7-inch display and a Wi-Fi radio simultaneously during normal use. When both pull current at the same time, the voltage on a degraded — or freshly fitted — cell dips sharply. The BMS reads that dip as a low-voltage cutoff condition and shuts the tablet down before the reported percentage reaches zero. This is a fuel gauge calibration problem, not a cell defect. After one full discharge-to-shutoff and an uninterrupted charge to 100%, the gauge recalibrates and the early shutdowns stop.
Fast charging not available after fitting a new cell
Samsung's adaptive fast charge protocol requires the charge IC to complete one accepted charge handshake with a new cell before it unlocks higher input rates. If the tablet shows only standard charging on the first cycle after a battery swap, that is expected behaviour — not a wiring fault. Charge the device fully once using the original Samsung charger and cable. Fast charge should activate automatically from the second cycle onward.