Samsung Galaxy S21 5G Battery EB-BG991ABY 4000mAh

Battery for Samsung Galaxy S21 5G: Restored Autonomy with 4000mAh

This replacement battery for the Samsung Galaxy S21 5G recovers your mobile phone's energy performance. The charging accumulator EB-BG991ABY allows you to reliably re-establish the daily operating cycle.

Technical Specifications

• Part type: Replacement battery
• Compatibility: Samsung Galaxy S21 5G (SM-G991B, SM-G991B/DS, SM-G991U, SM-G991U1, SM-G991W, SM-G991N, SM-G9910)
• Reference: EB-BG991ABY
• Capacity: 4000mAh
• Quality: Premium

When to Replace

• The charge drops rapidly within a few hours of use.
• The phone shuts down suddenly while a residual percentage is still visible.
• Abnormal heating at the back during recharging — confirm the diagnosis.
• The battery shows signs of swelling, pushing against the back cover.

Notes for the Technician

• Test before applying: connect the battery without gluing it and confirm that the device starts, charges and displays the percentage correctly. Thus, if there is any issue, the return or warranty is handled quickly and simply.
• Difficulty: Medium; opening the device requires prior heating of the back cover.
• Disconnect the wireless charging coil and remove the top shielding to access the connector.
• Apply isopropyl alcohol to the chassis to release the fixing adhesive tape without forcing the cell.
• New adhesive for closure and assembly is sold separately.

What Distinguishes This Version

This Premium version corresponds to the highest level of compatible parts available in the repair market. It is the suitable choice for technicians who want a stable replacement while maintaining an excellent cost-benefit ratio.

Frequently Asked Questions

Is the part compatible with the Samsung Galaxy S21+ or Ultra?

No, this EB-BG991ABY model is intended only for the base 6.2-inch Samsung Galaxy S21 5G.

The phone does not turn on, does replacing the part resolve it?

If the device does not respond to the charger and is not recognised by the computer, the fault may lie in the charging port or the motherboard — confirm the diagnosis.

Each unit is tested by Micro Wire before fast shipping from mainland Portugal. If you do not want to repair it, we can do it for you.