Galaxy S20 Ultra Battery Replacement: Cost & Guide
A Galaxy S20 Ultra battery replacement runs about $80 to $130 at a repair shop, or roughly $20 to $45 if you buy the cell and do it yourself. It is a moderate DIY job that restores a phone launched in February 2020 to close to its original runtime — and on a device this power-hungry, a fresh cell makes a bigger day-to-day difference than on almost any other Galaxy.
The S20 Ultra was Samsung's first "everything" flagship: a 6.9-inch 120 Hz display, a 108 MP main camera, and 100x Space Zoom, all fed by a large 5000 mAh battery. Those features draw serious current, so the cell was worked hard from day one. Several years and thousands of charge cycles later, it is usually the first thing to give out. If your phone dies by early afternoon or shuts off under camera load, the battery — not the whole device — is what needs attention.
How to check your Galaxy S20 Ultra battery health
Samsung builds a battery diagnostic into One UI, so start there. Go to Settings > Battery and device care > Battery > Diagnostics. On One UI 5 and later, the S20 Ultra reports a plain-language Battery health rating of Good, Normal, or Weak instead of an exact percentage. Given this phone's age, many S20 Ultra units now read "Weak" — Samsung's way of confirming the cell has degraded enough to justify replacement.
If your S20 Ultra is on an older One UI build without the Diagnostics menu, the honest tool is the free AccuBattery app, which measures the real charge flowing into the cell over several cycles and estimates true capacity against the factory 5000 mAh rating. It is a software estimate rather than a lab measurement and needs a few full charges to settle, but over a week or two it reliably confirms whether the battery has faded — a healthy S20 Ultra should still comfortably clear a full day.
Signs your Galaxy S20 Ultra battery is failing
Battery wear usually shows up as a cluster of symptoms rather than one:
- Galaxy S20 Ultra battery draining fast even after a restart, with the display dropped to 60 Hz, or right after a software update.
- Sudden shutdowns at 20 to 40 percent, especially in cold weather or mid-photo, because a worn cell can no longer hold voltage under load.
- The phone runs hot during camera use, gaming, or navigation — a compounding problem on a device that already draws heavy current.
- Charging misbehaves: it stalls, jumps percentages, or you see the Galaxy S20 Ultra battery not charging even on a known-good cable and adapter.
- Runtime a shadow of the all-day endurance you got when the phone was new.
Safety note: if the back glass starts to bulge, the frame separates, or you feel a raised spot behind the panel, stop using the phone. That is a swollen battery, and it is more common on older, hard-worked cells like this one. Do not press on it, puncture it, or keep charging it. Power the phone down, keep it somewhere cool and non-flammable, and replace the cell promptly. Swelling is a normal end-of-life failure mode for lithium-ion batteries, but a punctured cell can vent or catch fire, so it is the one symptom you never ignore.
Galaxy S20 Ultra battery replacement cost
Here is how the realistic 2026 options compare. Across every route the pattern is the same: labor is most of what you pay, while the cell itself is inexpensive.
| Option | Typical 2026 price | What you get |
|---|---|---|
| Samsung / authorized service (out of warranty) | $89 – $109 | Technician install, genuine part, mail-in or walk-in at partner locations |
| Local independent repair shop | $80 – $130 | Same-day service; part quality varies by shop |
| DIY replacement | $20 – $45 in parts | The battery cell plus adhesive and basic tools |
Searching "galaxy s20 ultra battery replacement near me" will surface both Samsung authorized partners and independent shops, and either is reasonable if you would rather not open the phone. But the price gap is real, and the galaxy s20 ultra battery replacement cost drops sharply when you supply the labor yourself.
The exact replacement battery for the Galaxy S20 Ultra
The Galaxy S20 Ultra uses a single 5000 mAh lithium-ion cell, sold under Samsung part code EB-BG988ABY. The phone is the SM-G988 series — sold as SM-G988U and SM-G988U1 in the US, and SM-G988B, SM-G988N, or SM-G9880 in other regions — and every S20 Ultra variant uses the same battery, so there are no per-carrier differences to track. Just make sure the part is specifically the EB-BG988ABY cell for the Ultra; the smaller S20 and S20+ use different, non-interchangeable batteries.
When you shop for a Galaxy S20 Ultra OEM battery, look for a full-capacity cell that ships with a fresh adhesive kit. You can find the right part and shipping options here:
- Browse replacement batteries at PhonePartPro — full-capacity 5000 mAh Samsung cells, available retail and wholesale with fast US shipping.
- Phone battery replacement guides by model
How to replace the Galaxy S20 Ultra battery yourself
Here is the honest difficulty rating first: the S20 Ultra is a moderate DIY repair. You access the battery through the glued glass back rather than the screen, which is more forgiving than a front-glass entry, but this is a large phone with strong adhesive and a heavy cell, so patience matters. Budget 45 to 90 minutes.
You will need a heat source (an iOpener, hair dryer, or heat gun on low), a suction cup, thin opening picks, a Phillips #00 driver, a plastic spudger, tweezers, and 90% isopropyl alcohol to help release the battery adhesive. This is the general process for how to replace a Galaxy S20 Ultra battery:
- Discharge below 25% first. A near-empty lithium cell is far safer to work around if it is accidentally nicked.
- Warm and lift the back glass. Heat the edges to soften the adhesive, seat the suction cup, and slide picks around the perimeter. Take extra care near the large rear camera module.
- Remove the shields and disconnect the battery first. Take out the screws holding the plastic mid-frame, then unplug the battery connector before touching anything else.
- Release the battery adhesive. This large cell is held by strong glue. Work isopropyl alcohol around and under the edges to dissolve it and lift with plastic tools only — never pry a metal object against the cell.
- Fit the new cell and reassemble. Seat the new EB-BG988ABY battery, reconnect it, and power on to confirm the phone recognizes it before you re-seal the back with fresh adhesive.
If reading through those steps makes you nervous, there is no shame in handing the phone to a shop — but plenty of first-timers manage this swap with the right tools and a slow, deliberate pace.
After the swap: what to expect
Once the new cell is in, power up and run a deliberate calibration cycle: charge the phone to a full 100%, use it normally until it drains to near 0% and shuts off, then charge uninterrupted back to 100%. A big 5000 mAh gauge needs a full cycle or two to re-learn true capacity, so ignore any odd percentage jumps in the first day — that is normal recalibration, not a defect.
Samsung phones do not use Apple-style parts pairing that locks out the device, so a good replacement cell simply works. On recent One UI versions you may see a one-time notice that a non-genuine battery was detected, and the Diagnostics screen may not report a fresh "Good" rating until the phone finishes recalibrating over those first couple of cycles. Give it two or three full cycles before you judge the result.
Repair vs. upgrade: is it worth it?
A $20 to $45 battery against a several-hundred-dollar replacement flagship is not a close call financially. The S20 Ultra was a genuine top-tier phone — its 108 MP camera and 120 Hz screen still hold up — so if the glass is intact, a fresh cell buys you years more service for a tiny fraction of an upgrade.
There is an environmental case, too, and it is the whole reason PhonePartPro exists: repair, don't replace. Manufacturing a new smartphone consumes far more raw material and energy than swapping a single battery. Replacing the cell keeps a still-powerful Galaxy S20 Ultra alive and e-waste out of a landfill — better for both your wallet and the planet.
FAQ
How much does a Galaxy S20 Ultra battery replacement cost?
Expect $89 to $109 through Samsung authorized service, $80 to $130 at an independent shop, or roughly $20 to $45 if you buy the 5000 mAh EB-BG988ABY cell and install it yourself. Labor, not the part, is most of the shop price.
How do I check Galaxy S20 Ultra battery health?
Go to Settings > Battery and device care > Battery > Diagnostics. On One UI 5 and later the phone shows a Battery health rating of Good, Normal, or Weak. If your build lacks that menu, use the free AccuBattery app over several charge cycles for a capacity estimate — it is a software estimate, not a lab number, but the most reliable gauge available.
Why is my Galaxy S20 Ultra battery draining fast?
The S20 Ultra draws heavy current for its 120 Hz screen and 108 MP camera, and after several years the original cell holds far less charge. Sudden shutdowns at 20 to 40 percent and heat during camera use point the same way. If drain persists after a restart with the display at 60 Hz, the cell is worn and a replacement restores runtime.
My Galaxy S20 Ultra is not charging — is it the battery?
First rule out the cable, adapter, and a lint-clogged USB-C port. If a known-good charger still stalls or the percentage reads erratically, a degraded battery is the likely culprit and a replacement cell usually resolves it.
How hard is it to replace the Galaxy S20 Ultra battery yourself?
It is a moderate repair. You reach the battery through the glued glass back, which is more forgiving than a front-glass entry, though this is a large phone with strong adhesive. Plan for 45 to 90 minutes with a heat source, suction cup, opening picks, a Phillips #00 driver, and a spudger. Discharge below 25% first and use isopropyl alcohol to release the battery adhesive.
Will a non-genuine Galaxy S20 Ultra battery cause a warning?
Samsung phones do not use Apple-style parts pairing, so there is no lockout. Recent One UI versions may show a one-time non-genuine battery notice, and after installation you should run a full charge-and-discharge calibration cycle so the battery gauge relearns true capacity.