Samsung Galaxy S21 Ultra Battery Replacement Vienna
Your Galaxy S21 Ultra no longer lasts four hours, suddenly switches off at 30% or runs hot while charging? Reparo replaces the original Samsung battery (5000 mAh, internally split into a dual-cell pack for faster charging) in Vienna – EUR 99 fixed price with a certified battery cell, a new IP68 seal and a 6-month warranty. Fast 25W charging plus 15W wireless charging stays fully intact. Usually finished in 60–90 minutes, with the Vienna pickup service or send-in from anywhere in Austria.
Galaxy S21 Ultra battery prices at a glance
Battery replacement
Fixed price, complete incl. fitting
- Certified Li-Polymer battery cell
- 3.85 V nominal voltage, original capacity
- Battery health calibration after fitting
- Fast-charging compatibility fully retained
- 6-month warranty on the cell and the labour
Diagnostic check without repair EUR 25 (waived if you go ahead with the repair). Vienna pickup service included.
Typical battery problems on the Galaxy S21 Ultra
- Your Galaxy S21 Ultra battery no longer lasts a single working day – the original cell used to give 5–7 hours of screen-on time
- The phone suddenly shuts off at 20–30% remaining charge and only powers back on once plugged in
- The 5000 mAh battery gets noticeably hot while charging or during 25W fast charging – a sign of chemical ageing
- The dual-cell structure shows uneven discharge: the percentage jumps from 60% to 20%
- 15W wireless charging no longer works or charges extremely slowly
- The casing bulges around the battery area – visible battery swelling (a result of deep discharge)
- The Galaxy S21 Ultra no longer starts at all after a full discharge – the battery is deeply discharged and won't take a charge
The Galaxy S21 Ultra launched in 2021 with a 5000 mAh dual-cell pack – and that exact spec ages audibly after 2–3 years. Ignoring battery shutdowns risks a deep discharge and permanent cell damage that makes a simple swap impossible. See our Galaxy S21 Ultra repair overview for every option.
How the Galaxy S21 Ultra battery replacement works
- Battery diagnosis via service mode
The Samsung service code *#0228# opens the battery status page. There we check the voltage, temperature and charge cycles of your Galaxy S21 Ultra. Capacity under 80% or a cycle count above 500 justifies a replacement.
- Detaching the display unit under controlled heat
On Samsung S/A devices the battery sits under the display – the OLED panel is warmed evenly to around 70 °C and released with flat carbon spudgers, without warping the Armor Aluminum frame.
- Removing the old battery in a controlled way
Both battery cells (the dual-cell layout) are glued to the housing. We dissolve the adhesive with 99% isopropanol and fine pull-tabs – never using a screwdriver as a lever. For swollen batteries: hazardous-goods disposal handled directly by Reparo.
- Fitting the certified battery cell
The dual-cell pack with 5000 mAh total capacity is connected to the original connector on the mainboard and fixed to the Armor Aluminum frame with Samsung adhesive. Polarity and contact pressure are checked – incorrect positioning costs 3% capacity.
- Display refitting + renewing the IP68 seal
The old adhesive film is removed completely, a fresh IP68 Samsung seal is applied and the display is re-bonded under defined pressure. After 30 minutes of curing time the seal ratings are restored.
- Full charge + calibration
A first charge to 100% at 25 °C room temperature – followed by a full discharge and another charge. This calibrates the battery gauge to the new cell characteristics. You get your Galaxy S21 Ultra back with a precisely calibrated battery.
Reparo works without a walk-in counter – your Galaxy S21 Ultra is collected by courier in Vienna or sent in from the provinces in a hazardous-goods-compliant shipping box.
Replacing the Galaxy S21 Ultra battery – process, price, battery life in Vienna
The Samsung Li-Po battery in the Galaxy S21 Ultra has 5000 mAh of capacity, built as a dual-cell pack split across two cells wired in parallel. After 500 to 700 full cycles (usually 2–3 years of everyday use) the usable capacity drops below 80% – you notice it through spontaneous shutdowns between 20 and 30%, a hot casing during 25W charging, or a visible bulge in the back. Our Galaxy S21 Plus shows similar symptoms, but the repair effort and price differ.
Reparo replaces the Galaxy S21 Ultra battery in Vienna for a EUR 99 fixed price – roughly 8% of its original launch price (EUR 1249). That includes certified 5000 mAh cells, a new IP68 seal, calibration and a 6-month warranty. If you also have screen cracks or touch issues, you save with a combined repair – see our separate S21 Ultra screen replacement for details.
Certified cell vs. original Samsung – what goes into the Galaxy S21 Ultra?
We fit certified battery cells into the Galaxy S21 Ultra that match the original Samsung specifications: the same nominal voltage (3.85 V), the same 5000 mAh capacity, the same charge curve. Original Samsung replacement cells for older models like the Galaxy S21 Ultra have only been available as remaining stock for some time now. Our cells measurably last just as long as the originals – 500 to 700 cycles with no significant capacity loss. You can see every option in the price comparison on the Samsung repair overview.
Frequently asked questions about the Galaxy S21 Ultra battery replacement
What does the battery replacement cost on the Galaxy S21 Ultra?
The Galaxy S21 Ultra battery replacement is a EUR 99 fixed price at Reparo in Vienna. Included: a certified Samsung-compatible battery cell with 5000 mAh, a new IP68 seal, calibration and a 6-month warranty. The diagnostic check (EUR 25) is waived if you go ahead with the repair.
How long does the new Galaxy S21 Ultra battery last?
With normal use the replacement battery lasts 500 full cycles at a minimum of 80% capacity – that works out to roughly 2.5 to 3.5 years of everyday use. One full cycle = a complete discharge from 100% to 0%. Partial charges count proportionally. The warranty applies for 6 months on the cell and the fitting.
Why does the Galaxy S21 Ultra have two battery cells instead of one?
Samsung uses a dual-cell design on the Galaxy S21 Ultra: the 5000 mAh is split across two smaller cells that charge in parallel. This enables 25W fast charging with less heat per cell. During the swap we fit both cells as one certified pack – replacing a single cell makes no technical sense.
Does the Galaxy S21 Ultra still charge at 25W just as fast after the battery replacement?
Yes. The Galaxy S21 Ultra supports 25W charging via the USB-PD protocol – that logic sits on the mainboard and is never touched during the battery swap. Our replacement cell matches the original charge curve, so you get the same charging times as with the factory battery.
Does 15W wireless charging stay intact on the Galaxy S21 Ultra?
Yes. The wireless charging coil sits under the Armor Aluminum back cover on the Galaxy S21 Ultra, not on the battery. During the battery swap we open the device from the front via the display – the back with its Qi coil stays untouched. The 4.5W reverse wireless charging (powering other devices on the Galaxy S21 Ultra back) also stays functional.
Does the IP68 water protection stay intact on the Galaxy S21 Ultra after the battery replacement?
Yes. With every battery replacement we fully renew the IP68 Samsung seal around the display. After a professional fit your Galaxy S21 Ultra regains full protection against splash water and brief immersion to 1.5 m. We generally don't recommend active diving after any housing intervention.
Does the display get damaged during the Galaxy S21 Ultra battery replacement?
Not with us. Samsung bonds the display and housing on the Galaxy S21 Ultra so that battery access is only possible via the display. We warm the adhesive layer in a controlled way to 70 °C and release the panel with flat carbon spudgers – no bending, no pressure. On 2% of repairs the adhesive film tears anyway; in that case we replace the bonding free of charge and the IP68 seal goes in new.
Can I drop my Galaxy S21 Ultra off at Reparo directly?
Reparo has no walk-in counter on site. You book an appointment online – our courier comes to your chosen address in all 23 Vienna districts (1010 to 1230). From the provinces you send the Galaxy S21 Ultra in insured, and the return shipping is included in the battery replacement price.
How does the Vienna pickup service work for the Galaxy S21 Ultra battery replacement?
Book online, pick a time slot between 9 am and 6 pm, and our courier drives to your Vienna address (1st district Innere Stadt to 23rd Liesing). The battery replacement takes 60–90 minutes in the studio, with return often the same day. Pickup costs start at EUR 7.90 by district.
Is shipping from the provinces safe for a Galaxy S21 Ultra battery?
Yes. Battery shipping falls under hazardous-goods class 9 – after booking we send you a special UN-approved shipping box. The Galaxy S21 Ultra travels to Vienna insured and compliant, and goes back the same way after the swap. We regularly get customers from Graz, Linz, St. Pölten, Klagenfurt, Innsbruck and Bregenz.
Is any data lost during the Galaxy S21 Ultra battery replacement?
No. The flash storage, Samsung account and SIM card are never disconnected during the battery swap. Photos, WhatsApp chats, apps, Wi-Fi passwords – all of it stays put. We still recommend a Samsung Cloud backup before any repair (free, 5 minutes via the Samsung account settings).
How long is the warranty on the new Galaxy S21 Ultra battery?
Six months on the battery cell and the fitting. If the cell loses more than 10% capacity in that time, we replace it free of charge. Not covered: deep discharge from leaving the phone unused for months, or damage from third-party chargers without USB-PD certification.
Do I lose the Samsung warranty through the Galaxy S21 Ultra battery replacement?
The original Samsung warranty has expired on most Galaxy S21 Ultra devices for 2+ years already. Our Reparo warranty on the new battery cell runs for 6 months from fitting – on the cell and the labour.
Is the Galaxy S21 Ultra battery replacement still worth it in 2026?
Yes. The Galaxy S21 Ultra still received Samsung security updates until 2025. A battery replacement at EUR 99 vs. a comparable used device with a fresh battery from around EUR 312 – plus the data migration, new setup and lost 2FA tokens.
My Galaxy S21 Ultra was flat for months – can the battery still be replaced?
Yes, but a diagnosis is mandatory. After a deep discharge of more than 3 months the cell can be so chemically damaged that it won't start up once fitted. We check the voltage and cell impedance in the diagnosis (EUR 25, waived on repair) – if only the cell is dead, the swap is enough. For mainboard damage from a deep discharge (rare) we discuss the alternatives.
Replace the Galaxy S21 Ultra battery in Vienna – book an appointment
Fixed price EUR 99, 60–90 minutes of work, a 5000 mAh certified cell, IP68 seal renewed, 6-month warranty. Diagnostic check EUR 25 waived on repair. Pickup service in Vienna or send-in from Austria.