Galaxy Note 20 Battery Replacement: Cost & DIY Guide
A Galaxy Note 20 battery replacement costs roughly $20 to $40 in parts for a DIY job, or $65 to $100 at a repair shop with labor included. It is a very achievable repair for someone willing to work carefully with a glued-back phone, and it is the cheapest way to bring a still-capable 2020 flagship back to all-day battery life.
The standard Note 20 shipped with a 4300mAh cell and a flat 6.7-inch screen. After several years and hundreds of charge cycles, that cell no longer holds what it used to — and because the Note 20 is a productivity phone with an S Pen, weak battery life hurts more here than on a device that mostly sits idle. Here is how to check it, price it, and fix it.
How to check your Galaxy Note 20 battery health
Samsung includes a native battery-health tool in newer versions of One UI. If your Note 20 has been updated to One UI 5 or later (Android 13), you can read it directly:
- Open Settings
- Tap Battery and device care
- Tap Battery
- Tap Diagnostics, then Battery health
Samsung reports the result as Good, Normal, or Weak, and on some builds as a maximum-capacity figure. A "Weak" rating, or anything meaningfully under 80% of original capacity, means the pack is worn out.
If your phone is still on an older One UI build with no Diagnostics menu, don't rely on guesswork. Download AccuBattery and let it measure a few real charge cycles. It calculates true capacity from actual charge current, so it will tell you honestly whether your 4300mAh cell is now closer to 3200mAh. That single number usually settles the repair-or-not question.
Signs your Galaxy Note 20 battery is failing
You rarely get one clean failure. Instead you get a pattern:
- Galaxy Note 20 battery draining fast — the phone that used to last a full day now needs a top-up by lunch.
- The percentage jumps or collapses, such as dropping from 35% straight to shutdown.
- Noticeable heat during charging, gaming, or S Pen note-taking.
- Random restarts or the phone dying while it still shows charge left.
- The processor feels throttled because One UI is protecting an aging cell.
- Galaxy Note 20 battery not charging reliably, or stalling at a fixed percentage.
Treat swelling as an emergency. If the back panel begins to separate, the display lifts, or the phone no longer sits flat, stop charging it right away. A swollen lithium cell can rupture or ignite. Shut the phone down, keep it clear of anything flammable, and replace the battery instead of squeezing more charges out of a bulging pack.
Galaxy Note 20 battery replacement cost
The Note 20 is past Samsung's main support window, so first-party service is inconsistent and rarely cheap. Here is the realistic 2026 breakdown:
| Option | Typical 2026 cost | Notes |
|---|---|---|
| Samsung / authorized service | $65–$95 | May no longer be offered for a 2020 phone; often quoted as a flat out-of-warranty fee. |
| Local repair shop | $65–$100 | Includes labor; confirm they install a fresh cell, not a random pull. |
| DIY with a quality part | $20–$40 | Battery plus adhesive; add roughly $10–$15 for a tool kit if needed. |
Anyone comparing the galaxy note 20 battery replacement cost against buying another phone quickly sees the point — a $30 battery versus a few hundred dollars for a used replacement is not a close call.
The exact replacement battery for the Note 20
The Note 20 uses a 4300mAh Li-ion cell, Samsung part number EB-BN980ABY. It fits the standard Note 20, sold as SM-N980F (4G) and SM-N981 variants (5G). Every carrier version of the base Note 20 shares this same physical pack.
The key thing to get right when shopping for a galaxy note 20 oem battery is capacity: the base Note 20 is 4300mAh, while the larger Note 20 Ultra uses a 4500mAh cell and a completely different part. They are not interchangeable, so confirm any listing says 4300mAh and references the N980/N981 numbers. A fresh, zero-cycle premium cell restores the runtime you remember; a tired pull does not. You can find correctly specced cells in the PhonePartPro replacement batteries collection, which ships quickly within the US at retail and wholesale pricing.
How to replace the Galaxy Note 20 battery yourself
Let's be honest about difficulty: this is a moderate repair, about a 5 out of 10. The Note 20's rear panel is glued, and the battery underneath is held by strong adhesive, so the challenge is patience rather than technical skill. There are no chip-level steps here — just careful opening and gentle adhesive work.
Step overview for how to replace the Galaxy Note 20 battery:
- Power down the phone and, ideally, drain it below 25% first so the cell is safer to handle.
- Heat and open the back. Warm the rear panel to soften the adhesive, then lift it with a suction cup and thin plastic picks. Work slowly around the edges.
- Disconnect the battery connector first, after removing the interior shield brackets, before touching anything else inside.
- Loosen the battery adhesive with isopropyl alcohol or an adhesive remover around the pack, then pull the stretch-release tabs steadily. Never pry a lithium cell with a metal tool.
- Install the new 4300mAh battery, reconnect it, and power on to confirm it works before sealing.
- Re-seal the back panel with fresh adhesive.
Set aside about an hour and watch a Note 20-specific teardown before you start. If the pack is badly swollen or the glass is already damaged, hand it to a shop instead.
After the swap: calibrate and check for warnings
Samsung does not lock out third-party batteries the way some manufacturers do, so your Note 20 will run normally on a quality replacement cell. What can happen is a temporarily inaccurate battery percentage while the phone's fuel gauge learns the new pack. Fix that with one calibration cycle: charge to 100%, leave it plugged in for another half hour, use it down to automatic shutdown, then charge uninterrupted back to 100%.
If your firmware supports the Diagnostics battery-health screen, it may show a generic reading for a cycle or two on a non-original cell. That is expected and not a fault, and no feature-disabling genuine-parts message appears on the Note 20.
Remember why you bought a Note: the S Pen and the multitasking features are what set it apart, and they are also what drain the battery hardest. Constant note capture, Air Command, split-screen apps, and Samsung DeX all lean on the cell. If you actually use the Note 20 as a productivity tool, a fresh battery restores the confidence to work off it all day without hunting for an outlet.
Repair vs. upgrade: the green math
A dead battery is almost never a reason to retire a phone this capable. The Note 20's screen, cameras, and S Pen are all still perfectly usable in 2026 — the only worn part is a $30 cell. Choosing a battery over a new phone saves you hundreds of dollars and keeps a working device out of the e-waste stream, where its glass, metals, and lithium would otherwise sit.
That is the case for repairing instead of replacing in one sentence: the most sustainable phone is the one already in your hand. To compare against other models in the lineup, see our battery replacement by model guide, and browse cells for the whole Galaxy range in the replacement batteries collection.
FAQ
How much does a Galaxy Note 20 battery replacement cost?
Around $20 to $40 for a quality cell if you do it yourself, or $65 to $100 at a shop with labor included. Where Samsung still services the 2020 Note 20, expect roughly $65 to $95.
How do I replace a Galaxy Note 20 battery?
Power down, heat and lift the glued back panel with a suction cup and picks, disconnect the battery connector first, loosen the adhesive under the cell and pull the stretch tabs, install a new 4300mAh battery, test, and re-seal the back. It is a moderate repair, about a 5 out of 10.
Why is my Galaxy Note 20 battery draining fast?
After several years the original 4300mAh cell has lost capacity, so it holds less charge. Heavy S Pen use, DeX, and background apps speed up the drain. If the phone can't make it through a normal day, the battery is worn and worth swapping.
What battery does the Galaxy Note 20 use?
A 4300mAh Li-ion cell, Samsung part EB-BN980ABY, fitting the SM-N980 (4G) and SM-N981 (5G) variants. Confirm the listing says 4300mAh, since the Note 20 Ultra uses a different 4500mAh pack that will not fit.
Is a Galaxy Note 20 battery replacement near me worth the extra cost?
A nearby shop is convenient and the safer choice if the cell is swollen or the back glass is cracked. But you will pay roughly double the parts cost for labor. If you are comfortable with a moderate glued-back repair, DIY is much cheaper.
Will a new battery cause a warning on my Note 20?
No. Samsung does not disable features for third-party batteries on the Note 20. The percentage may read inaccurately until you run one full calibration cycle, and the Diagnostics health rating can take a cycle or two to settle on a non-original cell.