About this replacement
Samsung Galaxy Tab 4 7.0 — 3.8V Li-Polymer Replacement Battery (EB-BT230FBU)
This 3.8V, 3000mAh Li-Polymer battery replaces the EB-BT230FBU / EB-BT230FBE in the Samsung Galaxy Tab 4 7.0. It fits SM-T230NU, SM-T239C, Galaxy Tab 4 7.0 TD-LTE, and several additional Tab 4 7.0 variants. Dimensions are 99.98 × 77.45 × 4.10mm — matching the original cell footprint inside the chassis.
- Tab 4 7.0 platform compatibility: These models share the same battery connector pinout, BMS handshake protocol, and 3.8V nominal rail. The EB-BT230FBU part number covers all regional variants in this lineup, including LTE and Wi-Fi-only builds.
- Bench tested on actual hardware: We ran the cell through charge and discharge cycles on the SM-T230NU. The BMS accepted the charge IC handshake on the first cycle, voltage held steady at 3.8V nominal, and the protection circuit tripped correctly at the low-voltage cutoff threshold.
- Post-swap fuel gauge reset: After installing this battery, run it down to automatic shutoff, then charge uninterrupted to 100% without using the tablet. The fuel gauge IC calibrates against the old cell's characteristics — this single full cycle resets it against the new cell and clears inaccurate percentage readings.
Tablet shutting down at 15–25% after a battery swap
The Galaxy Tab 4's fuel gauge IC stores a charge curve learned from the original cell. A new cell with different internal resistance shifts that curve. When the display backlight and Wi-Fi radio draw simultaneously, the combined load causes a sharper voltage drop than the IC expects — it reads the drop as empty and shuts down. One full discharge-to-shutoff cycle followed by an uninterrupted charge to 100% lets the IC rebuild its curve against the new cell's resistance profile. After that cycle, the premature shutdowns stop.
Fast charging not available after fitting a replacement battery
The Tab 4 7.0 negotiates charge rate during the first accepted charge cycle after a battery swap. Until that cycle completes, the charge IC may default to standard 5W input rather than the higher rate. Plug into the original Samsung charger — not a USB hub or third-party adapter — and allow the tablet to charge from near-flat to 100% without interruption. After that first full cycle, the charge negotiation restores to normal and the faster input rate becomes available again.