Galaxy S20 Battery Replacement: Cost & DIY Guide
A Galaxy S20 battery replacement runs about $60 to $90 at a repair shop, or $15 to $30 if you buy the 4000mAh cell and do it yourself. It's an afternoon job for a careful person with the right tools, and it can add two or three years to a phone that's otherwise still fast enough for daily life. The S20 launched in early 2020, so most units in service now are running on cells that have cycled well past their prime.
Below is exactly how to confirm the battery is the problem, what the replacement part is, what the swap involves, and how to decide whether it's worth doing versus buying a new phone.
How to check your Galaxy S20 battery health
Samsung builds a battery health readout into One UI, and the S20 supports it after its update to One UI 5 or later. Go to Settings → Battery and device care → Battery → Diagnostics, then tap Battery health. You'll see a status of Good, Normal, or Weak. Samsung doesn't publish an exact percentage the way iPhones do, so "Weak" is your signal that capacity has dropped enough to justify a new cell.
If your S20 is still on an older One UI build that doesn't show Diagnostics, don't guess. Install a free app like AccuBattery, then use the phone normally for a few charge cycles. AccuBattery estimates real-world capacity against the factory 4000mAh rating, and once you're seeing measured capacity down around 3,000mAh or lower, the battery is the reason your day is getting shorter.
Another quick check: dial up battery usage graphs under the same Battery menu. A healthy S20 shows a smooth discharge curve. A worn cell drops in steep steps and often falls off a cliff in the last 20 percent.
Signs your Galaxy S20 battery is failing
The classic pattern owners describe is a Galaxy S20 battery draining fast even when the phone is idle. Beyond that, watch for these symptoms:
- The phone shuts down at 20 to 30 percent, especially in cold weather.
- Screen-on time has collapsed from a full day to a few hours.
- The device runs hot during light tasks like messaging or maps.
- Charging is erratic, or the percentage jumps around unpredictably.
- The back glass feels raised, or the phone rocks on a flat table.
That last one is the important safety note. A swollen lithium-ion battery is pushing the back panel or screen away from the frame, and it should be taken seriously. Stop charging the phone, power it down, keep it away from heat, and don't puncture or bend the cell. A swollen battery needs to be replaced promptly and disposed of at an e-waste or battery recycling drop-off, never in household trash.
Galaxy S20 battery replacement cost
Here's what you can expect to pay in 2026 across the three common routes. Prices vary by region and by whether the shop is a Samsung authorized service center.
| Option | Typical 2026 price | What you get |
|---|---|---|
| Samsung / authorized service | $69 - $89 | Genuine part, technician labor, short warranty on the repair |
| Local / independent repair shop | $60 - $90 | Aftermarket or OEM-pull cell, same-day turnaround in most cases |
| DIY with a quality replacement battery | $15 - $30 (part) | The 4000mAh cell plus adhesive; your own labor and tools |
The gap between the shop price and the DIY part cost is almost entirely labor. If you already own a basic repair kit, the Galaxy S20 battery replacement cost drops to little more than the price of the cell itself. That's the case for doing it yourself, but only if you're comfortable working with heat and adhesive, which we'll cover below.
The exact replacement battery for the Galaxy S20
The Galaxy S20 uses a 4000mAh lithium-ion battery, Samsung part number EB-BG980ABY. It fits the standard S20 (4G and 5G), sold under model numbers SM-G980, SM-G981, SM-G9810, SM-G981B, SM-G981U, SM-G981N, and regional variants. Check the model number under Settings → About phone, or printed on the SIM tray, before you order so you get the correct cell.
Don't confuse the standard S20 battery with the larger cells in the S20+ (4500mAh) or S20 Ultra (5000mAh). They are physically different and not interchangeable. When you shop for a Galaxy S20 OEM battery or a quality aftermarket equivalent, confirm the EB-BG980ABY number and the 4000mAh rating. You can browse Samsung-compatible cells in our replacement batteries collection, priced for both single repairs and wholesale volume for shops.
Replacing the Galaxy S20 battery yourself
The S20 is a glass-sandwich phone, so the repair starts at the back, not the screen. Here's the step overview for how to replace a Galaxy S20 battery:
- Power off the phone and warm the back glass with a heat pad or hair dryer to soften the adhesive around the rear panel.
- Use a suction cup and thin pry tool to lift the back glass slowly. Watch for the fingerprint sensor and NFC/wireless-charging flex cables attached to the panel.
- Remove the plastic charging-coil bracket (several small Phillips screws) to expose the battery.
- Gently release the battery adhesive. A few drops of isopropyl alcohol under the edges helps loosen the strips. Pry with a plastic tool only, never metal, and never bend the old cell.
- Seat the new 4000mAh battery, run fresh adhesive, reconnect the flex cables, and reattach the back glass with new adhesive.
Honest difficulty rating: moderate, about a 6 out of 10. The heat-and-pry back glass removal is where most people slip up, and cracking the rear panel is a real risk if you rush. If your S20 also has water-resistance you want to preserve, replacing the perimeter adhesive properly matters. Budget an hour, work on a clean lit surface, and don't force anything that feels stuck; add more heat instead.
After the swap: calibrate the battery
Samsung phones don't show an "unknown part" lock the way some devices do, but you may see a notification that a non-genuine battery was detected if you install an aftermarket cell. That message doesn't disable the phone; it's informational, and the battery works normally.
What we do recommend is a calibration cycle so the fuel gauge reads accurately from day one. Charge the phone to 100 percent and leave it on the charger a little longer. Then use it normally until it powers off on its own from an empty battery. Charge back to a full 100 percent uninterrupted. That single deep cycle re-syncs the software's capacity estimate with the new cell, and it usually clears up any odd percentage jumps in the first day or two.
Repair vs. upgrade: is a new battery worth it?
A $15 to $30 battery against a $700-plus new flagship is not a close call for most people. The Galaxy S20 still has a sharp 120Hz display, a capable camera system, and plenty of processing power for messaging, streaming, navigation, and everyday apps. In nearly every case, the only thing standing between it and another two or three years of service is the worn cell.
There's an environmental angle too, and it's not a small one. Manufacturing a new smartphone generates the large majority of its lifetime carbon footprint, most of it before the phone is ever switched on. Swapping a battery keeps a perfectly good device out of the e-waste stream and skips all that upfront impact. At PhonePartPro our whole mission is repair, don't replace: keep devices alive and keep e-waste out of landfills. A fresh battery is the single highest-value repair you can make on a phone this age.
If you decide to go the DIY route, start with our replacement batteries collection, and if you own or run a repair business, ask about wholesale pricing on volume orders. For other devices, our full battery replacement by model guide covers the rest of the Galaxy and iPhone lineup.
FAQ
How much does a Galaxy S20 battery replacement cost?
Expect $60 to $90 at a repair shop or an authorized service center in 2026. If you do it yourself, the 4000mAh replacement battery costs roughly $15 to $30, plus adhesive and basic tools.
Why is my Galaxy S20 battery draining fast?
After several years of charge cycles, the original cell loses capacity, so it drains faster and may shut down before hitting zero. Rule out rogue apps and a runaway display brightness first, but if screen-on time has fallen sharply, the battery itself is worn and worth replacing.
How do I replace a Galaxy S20 battery?
Heat and lift the back glass, remove the wireless-charging bracket, release the old battery adhesive with a plastic pry tool and a little isopropyl alcohol, then seat the new 4000mAh cell with fresh adhesive and reassemble. It's a moderate repair, about an hour for a careful first-timer.
What is the exact Galaxy S20 battery?
It's a 4000mAh lithium-ion cell, Samsung part EB-BG980ABY, fitting model numbers SM-G980, SM-G981, SM-G9810, SM-G981B, SM-G981U, and regional variants. It is not the same battery as the S20+ or S20 Ultra.
How can I check my Galaxy S20 battery health?
On One UI 5 or newer, go to Settings → Battery and device care → Battery → Diagnostics → Battery health. If your build doesn't show that menu, install AccuBattery and measure real capacity against the 4000mAh factory rating over a few cycles.
Should I calibrate the battery after replacing it?
Yes. Charge to 100 percent, use the phone until it powers off on its own, then charge uninterrupted back to 100 percent. This single deep cycle re-syncs the fuel gauge with the new cell and clears up early percentage jumps.