Replacing the dual battery system in the Samsung Galaxy Z Fold7 is necessary when your device struggles to hold a charge or shuts down unexpectedly. This foldable phone features a complex internal layout with heavy adhesive and two separate battery cells. You can expect a challenging repair process that requires patience and precision to avoid damaging the delicate displays.
Required Tools
- 1
Power Off and Prepare
- Turn off your Samsung Galaxy Z Fold7 completely before starting any repair work.
- Remove the SIM card tray to prevent it from snagging on internal components during disassembly.
- 2
Remove the Back Glass
- Apply heat to the edges of the rear glass panel to soften the underlying adhesive.
- Use a heavy-duty suction cup to lift the panel slightly, then insert a plastic pick to slice through the glue around the perimeter.
- 3
Disconnect the Wireless Charging Coil
- Unscrew the Phillips #00 screws securing the wireless charging coil and NFC antenna assembly.
- Carefully lift the coil and disconnect its flex cable from the motherboard using a nylon spudger.
- 4
Disconnect the Batteries
- Locate the two battery connectors on the main logic board.
- Use a plastic spudger to gently pry both connectors straight up from their sockets to ensure the device is completely de-energized.
- 5
Remove the Sub-Board Cables
- Detach the interconnect cables that run over the primary battery.
- Fold them back gently so they are out of the way during the battery extraction process.
- 6
Apply Isopropyl Alcohol
- Apply a few drops of high-concentration isopropyl alcohol around the edges of both battery cells.
- Allow the alcohol to sit for a couple of minutes to weaken the strong adhesive securing the batteries to the frame.
- 7
Extract the Batteries
- Use a plastic spudger or the built-in pull tabs to gently pry both batteries out of their respective compartments.
- Never use metal tools for this step to avoid puncturing the lithium-ion cells and causing a fire.
- 8
Prep for the New Batteries
- Clean any leftover adhesive from the frame using isopropyl alcohol and a lint-free cloth.
- Apply new adhesive strips to the battery compartments to ensure the replacement cells stay firmly in place.
- 9
Install the New Batteries
- Press the new primary and secondary batteries into their housings.
- Reconnect their flex cables to the motherboard to restore power to the system.
- 10
Reassemble the Device
- Reconnect the interconnect cables and reinstall the wireless charging coil assembly with its screws.
- Apply fresh adhesive to the back glass panel and press it firmly onto the frame to seal the device.
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.
FAQ
Why does the Z Fold7 have two batteries?
The foldable design requires weight distribution across both halves of the device. Splitting the 4400 mAh capacity into two cells allows the phone to remain incredibly thin while balancing the internal components.
Can I use a hair dryer instead of a heat gun?
Yes, a hair dryer can work if you do not have a heat gun. You will just need to apply the heat for a longer period to adequately soften the stubborn adhesive.
What should I do if a battery starts smoking?
Immediately stop the repair and move the device to a fire-safe location outside. Punctured lithium-ion batteries are extremely dangerous, which is why you must only use plastic tools during removal.
Will this repair compromise the water resistance?
Yes, opening the device breaks the factory waterproof seal. You must apply high-quality replacement adhesive during reassembly, but you should still keep the phone away from moisture afterward.
Sources
Professional Device Repair vs. DIY Guides
While our step-by-step guides are perfect for troubleshooting minor issues at home, complex hardware faults require expert intervention. If you are facing critical issues, choosing a professional phone repair Slovenia or laptop repair Slovenia service ensures your device is handled safely without risking further damage.
Why Choose KRON Servis for Your Tech Repairs?
At KRON Servis, we repair over 3,284 devices every month with an outstanding customer rating of 4.9/5. Whether you need a reliable phone repair Ljubljana or comprehensive servicing for consoles, TVs, and smart mobility, our certified technicians are here to help. We operate in two convenient locations: Zagrebška cesta 83a in Maribor and Vilharjeva cesta 29 in Ljubljana, open Monday to Friday from 8:00 to 16:00.
We use high-quality OEM parts and offer a 12-month warranty on all repairs. Professional diagnostics are available for 25 € (VAT included). Avoid the risks of DIY mistakes and let our experts restore your device. For more details on our rates, visit our pricing page, check our services, or contact us directly at questions@kron.si or via our contact form. You can also track your device anytime on our repair status page.