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Samsung Galaxy Tab A 8.4 2020 EB-BT307ABY Replacement Battery 3.85V 4800mAh

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From $34.99 USD $43.99
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Fits Galaxy Tab A 8.4 2020 models SM-T307U and replaces OEM battery EB-BT307ABY.
3.85V Li-Polymer cell at 4800mAh delivers 18.48Wh—sufficient for full-day tablet use with moderate screen time.
Connector seats flush into the battery slot with no locking tab; orientation marked on the housing.
We tested the cell on a Galaxy Tab A 8.4 2020 stock charger; BMS accepted the pack on first insertion without fault codes.
Run one full discharge to automatic shutoff followed by uninterrupted charge to 100%—this recalibrates the fuel gauge IC and corrects inaccurate percentage display after the swap.
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Battery Care Tips

🔹 Getting Started

Charge your new battery fully before you use it for the first time. Over the next few charge cycles, run your device down to around 20% before you recharge—this helps the battery perform its best. After that, charge whenever you need to.

🔹 Keep It Healthy

Avoid letting your battery completely drain or staying plugged in constantly. Both extremes wear it out faster. Store the battery in a cool, dry place when you're not using it, since heat damages batteries quickly.

Delivery and Shipping

🔹 Most orders ship the next day, and we use FedEx, UPS, Purolator and other carriers to get them to you. Lithium batteries have to ship by ground only, not air or USPS. Make sure your address is right before you order, because if we have to send it back, you pay for shipping again.

Disclaimer

⚠️ Disclaimer: All product names, trademarks, and registered trademarks belong to their respective owners.

🔹 We use these names, brands, or model numbers only for identification and compatibility purposes.

Voltage

3.85V

Amp

4800mAh

Samsung Galaxy Tab A 8.4 2020 — 3.85V Li-Polymer Replacement Battery (EB-BT307ABY)

This 3.85V, 4800mAh Li-Polymer battery replaces the OEM EB-BT307ABY cell in the Samsung Galaxy Tab A 8.4 2020 (SM-T307U). It fits tablets where the original cell no longer holds charge across a full day of browsing, video, or productivity use. Capacity figure is 4800mAh — use this value, not anything listed elsewhere.

  • SM-T307U fit: The SM-T307U is the US-market variant of the Tab A 8.4 2020. It uses the EB-BT307ABY form factor — 103.26 x 99.70 x 3.00mm — with a specific flex connector orientation that differs from adjacent Tab A generations. This cell matches that connector and fits the chassis without modification.
  • Bench tested on actual hardware: We cycled this cell through charge and discharge on the SM-T307U platform and confirmed the BMS handshake completed on first charge. The fuel gauge IC accepted the new cell and began tracking state-of-charge without fault codes.
  • Post-swap fuel gauge reset: After installation, run the tablet down to automatic shutoff, then charge uninterrupted to 100% without using the device. The SM-T307U fuel gauge IC calibrates against the new cell during this cycle and clears the inaccurate percentage readings that typically appear in the first few hours after a swap.

Tab A 8.4 2020 shutting down at 15–25% remaining

The SM-T307U draws significant combined load when the display is at full brightness and Wi-Fi is actively transferring data. Under that load, a degraded or freshly swapped cell can drop below the BMS cutoff voltage before the reported percentage reaches zero. The tablet powers off abruptly because the voltage collapses faster than the fuel gauge updates. After completing one full discharge-and-charge calibration cycle, the reported percentage aligns with the actual cell voltage curve and the early shutdowns stop.

Fast charging unavailable after battery replacement on SM-T307U

The Tab A 8.4 2020 uses Samsung's Adaptive Fast Charging protocol, which requires the charge IC to negotiate with both the charger and the battery's BMS before enabling the higher charge rate. On a freshly installed cell, this negotiation sometimes fails on the first cycle because the BMS hasn't completed its initial handshake. Connect the original Samsung charger — not a third-party USB-C adapter — and complete one full uninterrupted charge to 100%. The protocol re-negotiates on the second cycle and fast charging becomes available from 0V cell recovery upward.

Compatible Models

Galaxy Tab A 8.4 2020 SM-T307U

Replaces Part Numbers

EB-BT307ABY

Technical Specifications

Voltage3.85V
Amp Hours4800mAh
Capacity4800mAh
Rate18.48Wh
Net Weight75g /2.65 oz
Gross Weight215g /7.58 oz
Approximate Weight215g /7.58 oz
Dimension 103.26 x 99.70 x 3.00mm

Product Highlights

  • Brand: Samsung
  • Manufacturer: CS
  • Series: Standard
  • Color: Black
  • Product Type: Li-Polymer
  • Battery Type: Li-Polymer
  • Warranty: 12 Months
  • Bulk Orders: sales@batteryweb.com

Frequently Asked Questions

My Tab A 8.4 2020 says 60% battery but then shuts off without warning — is that the new battery or the software?

That's a fuel gauge IC calibration issue, not a defective cell. The fuel gauge IC in the SM-T307U was calibrated to the curve of the old, degraded cell and doesn't yet match the new one. Run the tablet down to automatic shutoff — don't force it — then charge uninterrupted to 100%. After that single full cycle, the percentage display tracks accurately and the unexpected shutoffs stop.

Fast charging worked before the battery swap but now the Tab A only trickle charges — what changed?

Samsung's Adaptive Fast Charging protocol requires the charge IC and the battery BMS to complete a handshake before the higher charge rate activates. On a new cell, this negotiation doesn't always succeed on the very first charge. Use the original Samsung wall adapter, not a third-party USB-C charger, and let it charge to 100% without interruption. The protocol re-negotiates on the second charge cycle and full fast-charge rate resumes.

The battery percentage is dropping faster than expected from 100% — went from full to 40% in what felt like no time

This is fuel gauge drift — the SM-T307U's fuel gauge IC is still running the discharge curve it learned from the old cell. The new 4800mAh cell has a different voltage-to-capacity profile, so the reported percentage falls steeply at first. One complete discharge to automatic shutoff followed by a full uninterrupted charge to 100% resets the IC's learned curve. After that cycle, the percentage drop rate reflects actual capacity.

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