Fairphone 4 Battery Replacement Vienna
Does your Fairphone 4 barely last half a day, shut down unexpectedly or no longer charge at all? That is a clear sign of a worn-out battery. We replace the 3905 mAh cell in Vienna — fast, transparent and with 6 months warranty on the repair.
When is a battery replacement on the Fairphone 4 worthwhile?
A smartphone battery loses significant capacity over time. On the Fairphone 4 you usually notice this when the device suddenly switches off at 30 % charge, heats up strongly while charging or no longer lasts a whole day. Typical signs where we recommend a battery replacement:
- Battery drains within a few hours despite normal use
- Device switches off unexpectedly at a low charge level
- Battery only charges slowly or not at all anymore
- Device becomes unusually hot while charging
- Battery indicator jumps erratically or stays frozen
The Fairphone 4 is designed for longevity — with a fresh battery you can easily get another two to three years out of the device without having to switch to a new model.
How the Fairphone 4 battery replacement works
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Send in your device or use the pickup service You conveniently send in your Fairphone 4 by post or use our pickup service in Vienna. We confirm receipt and check the device right after it arrives.
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Diagnostic check and condition assessment We check the battery capacity, the charge cycle condition and whether other components are affected. The diagnostic check costs 25 € — this amount is waived in full when you place a repair order.
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Replace the battery cell professionally Thanks to the modular design of the Fairphone 4, the battery can be replaced relatively cleanly and without unnecessary damage. We install a tested replacement cell with 3905 mAh.
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Function test and completion After installation we test the charging process, discharge speed and temperatures under load. Only once everything is right does the device go back to you.
Spare part: 3905 mAh battery cell for Fairphone 4
The Fairphone 4 uses a fixed battery cell with a capacity of 3905 mAh. We install tested replacement cells that are designed for full capacity and stable charging performance.
Why a battery replacement on the Fairphone 4 makes particular sense
The Fairphone 4 is explicitly designed for repairability. A battery replacement extends the life of the device considerably — and at a fraction of the price of buying new. New price of a comparable model: around 400–500 €. Our battery replacement: 69 €.
No walk-in possible — you conveniently send in the device by post or we pick it up in Vienna.
Frequently asked questions about the Fairphone 4 battery replacement
What does the Fairphone 4 battery replacement cost?
The battery replacement on the Fairphone 4 costs 69 € with us — this is a flat price that includes the new battery cell as well as the installation work. No further costs are added as long as no additional damage is found.
How long does the battery replacement on the Fairphone 4 take?
The installation itself takes 30 to 45 minutes. On top of that comes the time for shipping or pickup. As a rule, your Fairphone 4 is back with you within one to two working days.
Which battery cell is installed in the Fairphone 4?
We replace the original 3905 mAh cell with a tested replacement cell of the same capacity. It is matched to the charging performance and temperature limits of the Fairphone 4.
Is data lost during the battery replacement?
During the battery replacement on the Fairphone 4 your data usually remains fully intact. Nevertheless we generally recommend an up-to-date backup before you send in the device or release it for pickup.
Can I drop off the Fairphone 4 in person?
No, we have no open customer access. You can send in your Fairphone 4 by post or use our pickup service in Vienna — we come directly to you and collect the device.
How does the pickup service work?
After you book an appointment we arrange a suitable time slot. We pick up your Fairphone 4 in Vienna, repair it and then deliver it back to you. The service is specifically intended for customers in Vienna.
Can I also send the device in by post?
Yes, the shipping option is available Austria-wide. You send your Fairphone 4 to us securely packed, we repair it and send it back after a successful repair and payment.
What does the diagnostic check on the Fairphone 4 cost?
The diagnostic check costs 25 €. This amount is waived in full as soon as you place a repair order. So you only pay for the repair — not diagnostic check plus repair.
Is there a warranty on the battery replacement?
Yes, we give 6 months warranty on the installed battery cell and the repair work. Should any problems arise from the repair itself within this period, we fix them free of charge.
Is a battery replacement worthwhile or should I buy a new Fairphone?
The Fairphone 4 (2021) still costs around 400–500 € new. A battery replacement for 69 € is therefore in almost all cases the more economical choice — especially since the device runs reliably for another two to three years with a fresh battery. Your data is preserved and you keep your familiar device.
Are original Fairphone batteries used?
We install tested replacement cells that are matched to the specifications of the Fairphone 4. Whether an original or high-quality third-party cell is available in an individual case, we tell you transparently before the repair.
What happens if further damage is discovered when opening the device?
If we find additional damage when opening the device, we inform you immediately and lay out the options. You decide whether and which further repairs should be carried out — no intervention without your consent.
Can a defective battery damage the display or other components?
In rare cases a swollen battery can exert pressure on the display from the inside and damage it. If your Fairphone 4 shows slight bulges on the housing or the back lifts slightly, you should act promptly and stop charging the device.
Fairphone 4 switches itself off — battery or mainboard?
When the Fairphone 4 suddenly switches itself off (fairphone 4 switches itself off, fairphone 4 turns off), the battery is the cause in over 80 % of cases — the 3,905 mAh module battery no longer delivers the required voltage under load (camera, gaming, 5G), the mainboard recognises this as unsafe and triggers the safety shutdown. Diagnostic hint: if the shut-off typically happens at a low battery level (under 30 %) or while gaming/calling, it is the battery. Other possible causes: a poor battery module contact in the modular slot (rare — cleaning is enough), or a mainboard defect at the PMIC (very rare on the FP4). We check this as part of the diagnostic check 25 € and replace the battery module for 69 € fixed price — data is preserved, 6 months warranty.
How do I recognise a swollen battery on the Fairphone 4?
Typical signs are: the housing bulges slightly or the back can be lifted, the device becomes unusually warm while charging, or the battery drains extremely fast. In this case please stop connecting the device to the charging cable and contact us immediately.
Fairphone 4 battery empty? We sort it out.
Pickup service Vienna or send-in Austria-wide — 69 €, 6 months warranty, no hidden price.