Samsung Galaxy Z Fold8 Battery Replacement
A battery replacement is necessary when your Galaxy Z Fold8 suffers from rapid capacity loss, spontaneous shutdowns under load, or physical frame separation caused by cell swelling. Because this foldable architecture distributes its 4,800 mAh capacity across two separate physical battery cells in opposite halves of the phone, both housing sections must be systematically opened. Technicians must work deliberately around the internal hinge mechanisms and delicate display flex assemblies to avoid catastrophic damage.
Required Tools
- Heat gun or heated repair mat
- Heavy-duty suction handle
- Thin plastic opening picks
- Phillips #00 precision screwdriver
- ESD-safe plastic pry spudger
- Curved ESD tweezers
- Isopropyl alcohol (90% or higher purity)
- Pre-cut replacement battery and panel adhesive strips
- Safety glasses and anti-static wrist strap
Step by step
- 1
Step 1: Discharge and Power Down
Discharge the phone below 20% to minimize thermal runaway risks if a cell is damaged, then power down the device completely.
- 2
Step 2: Soften Rear Adhesive
Place the folded phone on a heating pad set to 75°C for five minutes, or run a heat gun around the perimeter of the outer glass panels until warm to the touch.
- 3
Step 3: Separate the Primary Rear Glass
Affix a suction handle to the lower third of the rear camera cover panel, pull upward gently to form a gap, insert a plastic opening pick, and cut through the adhesive perimeter without inserting the pick deeper than 4 mm.
- 4
Step 4: Remove Wireless Charging Coil and Bracket
Remove the Phillips #00 screws securing the upper motherboard shield and the graphite wireless charging assembly, then lift the bracket out of the frame.
- 5
Step 5: Disconnect Main Battery Cables
Using an ESD-safe plastic spudger, immediately disconnect both battery flex cables from the logic board to eliminate electrical current before touching other components.
- 6
Step 6: Open the Secondary Housing Cover
Apply moderate heat to the secondary exterior cover panel, trace the seam with an opening pick to slice the perimeter glue, and unthread the secondary internal shield screws to expose the second battery.
- 7
Step 7: Extract the Primary Battery
Pull the integrated battery stretch-release tabs at a low, flat angle; if the tabs snap, introduce several drops of high-purity isopropyl alcohol along the edge of the compartment and lever the cell out using only a wide plastic spudger.
- 8
Step 8: Extract the Secondary Battery
Repeat the adhesive release process on the secondary battery located in the opposite housing half, ensuring you never bend, twist, or puncture the pouch against the frame edges.
- 9
Step 9: Clean Recesses and Seat New Cells
Clear away all remaining adhesive residue from both chassis wells using isopropyl alcohol, install new pre-cut adhesive film, and press the new replacement cells firmly into their positions.
- 10
Step 10: Reinstall Brackets and Reconnect Power
Mate both battery flex connectors squarely to the logic board, then secure the midframe brackets, graphite cooling pads, and wireless charging coil using the original Phillips screws.
- 11
Step 11: Seal the Outer Panels
Remove residual adhesive along the frame borders, lay down fresh pre-cut adhesive gaskets, align the glass panels, and apply uniform clamping pressure across the device for 15 minutes.
Would you rather leave the repair to the experts?
Disclaimer: repairs are done at your own risk. Devices contain batteries and live components; improper handling can cause injury or fire. For a safe, warrantied repair, contact us.
Frequently asked questions
Yes, you must always replace both battery cells together because the Galaxy Z Fold8 balances charging and discharging across two interconnected packs. Installing an old cell alongside a new one leads to capacity mismatch, overheating, and inaccurate fuel gauge calculations.
Yes, opening the phone breaks the factory water-resistant seal. While fresh pre-cut adhesive gaskets provide everyday dust and splash resistance, the phone will no longer retain its certified IP48 submersion rating.
Never use metal tweezers, screwdrivers, or blades near lithium-ion pouches. Puncturing the outer foil will ignite an internal short circuit, toxic fume discharge, and thermal runaway.
Charge the device uninterrupted until it reaches 100%, leaving it plugged into the charger for an additional hour. Then run the phone down through normal use until it powers off at 0%, followed by one uninterrupted charge back to 100%.
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