Genuine Samsung Galaxy S21 5G Battery EB-BG991ABY 4000mAh

Restore Full Power to Your Samsung Galaxy S21 5G

If your Galaxy S21 5G shows no power, drains fast, or won't hold a charge, this genuine 4000mAh battery, part number EB-BG991ABY, is the exact part used in Samsung's official warranty repairs.

Key Features

• Original Samsung battery, not aftermarket
• Compatible with SM-G991 Series
• 25W fast charging, 15W wireless
• Pre-applied adhesive

Compatible Models

• SM-G991B
• SM-G991B/DS
• SM-G991U
• SM-G991U1
• SM-G991W
• SM-G991N

Technical Specifications

Calibrating Your New Battery

Charge fully to 100%, hold 2 extra hours, drain to empty through normal use, then charge fully again uninterrupted.

Why Battery Health Declines

Lithium-ion cells drop below 80% health after 500–800 charge cycles. Heat and fast-charging habits speed this up.

Package & Delivery

1x battery. Free standard UK delivery, with next-day delivery also available at checkout. Free 30-day returns.