Galaxy Note 8 Battery Replacement: Cost & DIY Guide
A Galaxy Note 8 battery replacement costs about $15 to $30 if you do it yourself and roughly $50 to $85 at a repair shop. It's a genuinely DIY-friendly repair — soften the back glass, swap the 3,300mAh cell, re-seal — and on a 2017 phone, replacing an aging battery isn't just about better runtime; it's the responsible thing to do for safety.
The Galaxy Note 8 is now one of the oldest phones people still keep in daily use, and age is the whole story here. Its original 3,300mAh battery was modest even at launch — Samsung played it deliberately conservative on capacity after the Note 7 recall — and after eight-plus years of charge cycles, most Note 8 batteries are worn out and some are starting to swell. That makes a replacement the single most important repair this phone can get. Here's exactly what it costs and how to do it safely.
Signs your Galaxy Note 8 battery is failing (start here)
On a phone this old, the most important symptom is physical, not just runtime:
- Swelling — the critical safety sign. If the screen is lifting off the frame, the phone rocks when placed flat on a table, or the glass back is bowing outward, stop charging and stop using the phone immediately. The Note 8's curved rear glass sits directly on top of the battery, so a swelling cell pushes outward and can crack that back glass from the inside. A bulging lithium-ion battery is a real fire and puncture hazard. Never press it flat, never puncture it, and don't leave it charging unattended — replace the cell or recycle the device promptly.
- Galaxy Note 8 battery draining fast — a phone that struggles to last half a day, with screen-on time a fraction of what it once was.
- Sudden shutdowns at 30–40%, then the charge jumping back up when plugged in.
- Running hot while charging or gaming, or charging much more slowly than before.
- Galaxy Note 8 battery not charging reliably, or sticking at a percentage.
Because the Note 8 sat on the modest end for battery size to begin with, drain complaints were common even when it was new — and a decade later, a worn or swelling cell is the norm, not the exception.
How to check your Galaxy Note 8 battery health
Open Settings → Battery and device care → Battery to see usage history, remaining-time estimates, and which apps drain the most. There's no native battery-health percentage on the Note 8, though — Samsung never built a health readout into its software, so you can't see how much of the original 3,300mAh remains from the menus alone.
The honest way to measure wear is AccuBattery from the Play Store. After a few charge cycles it estimates your real capacity against the 3,300mAh design spec, so you might learn you're down to 2,200mAh — about 67% of new. Samsung Members → Get help → Interactive checks can also run a battery test, but it only reports pass/fail. For an actual number, use AccuBattery.
Galaxy Note 8 battery replacement cost
Here's 2026 pricing. The Note 8 is long past Samsung's support window, so manufacturer-authorized service is often unavailable for it — most owners go with a local shop or DIY.
| Option | Typical 2026 price | Notes |
|---|---|---|
| Samsung / authorized (uBreakiFix) | $75–$90 | Rarely available for this end-of-life model; includes labor if offered |
| Local repair shop | $50–$75 | Usually same-day; ask for a fresh cell, not a pull |
| DIY with a quality battery | $15–$30 | Battery plus basic tools; you supply the labor |
Nearly all of your Galaxy Note 8 battery replacement cost as a DIY job is the cell itself, typically $12–$25 for a quality 3,300mAh replacement, plus a few dollars for adhesive and picks. Our zero-cycle Galaxy Note 8 battery (3.85V, 3,300mAh) is the exact part for this repair.
The exact replacement battery for the Note 8
The Galaxy Note 8 uses a 3,300mAh lithium-ion battery, Samsung part number EB-BN950ABE, rated at 3.85V. It fits the whole Note 8 family — sold as SM-N9500, SM-N950B, SM-N950F, SM-N950N, SM-N950U and SM-N950U1 across unlocked, international, and US carrier variants. There's only one Note 8 body, so every unit takes the same EB-BN950ABE cell — no larger or smaller variant to sort out.
Shopping for a Galaxy Note 8 OEM battery or OEM-equivalent, match that part number and the flex-connector position. A "zero-cycle" cell hasn't been charged in service, so it arrives fresh at the full rated 3,300mAh — important on a phone whose original battery is a decade into its life. Genuine new-old-stock is essentially gone for a phone this old, so a quality zero-cycle replacement is the practical, honest choice.
How to replace a Galaxy Note 8 battery yourself
Difficulty: moderate-to-hard (about 7/10). The Note 8 opens from the back through firmly bonded, curved glass, and if the battery has already swollen, removal calls for extra care. Take your time — the risk here is cracking the rear glass or nicking a swollen cell. Budget an hour or a bit more.
The step overview for how to replace a Galaxy Note 8 battery:
- Power off and gather your tools: a heat source (hair dryer, heat mat, or iOpener), thin picks, a suction cup, a Phillips #00 driver, and plastic spudgers.
- Warm the back glass evenly for a minute or two to soften the adhesive, then lift a corner with the suction cup and pick and cut around the perimeter. If the glass is already cracked from swelling, tape it first so it doesn't shatter.
- Remove the internal bracket and wireless-charging coil, then disconnect the battery flex connector first, before any other cable.
- Free the old cell gently. It's held with stretch-release adhesive; pull the tabs slowly, or apply isopropyl alcohol under the edges to loosen it. If the battery is swollen, be extra careful — never bend, fold, or puncture it, as a damaged lithium cell can vent or ignite.
- Seat the new EB-BN950ABE battery, reconnect the flex, and power on to confirm before sealing.
- Re-seal the back glass with fresh pre-cut adhesive and press evenly for several minutes.
If this is your first teardown, watch a full Note 8 video first, and take the old battery — especially a swollen one — to a proper battery-recycling drop-off rather than the trash.
After the swap: calibrate and reconnect
Samsung phones have no iPhone-style parts lockout, so the Note 8 will simply boot and run on the new cell. To get an accurate gauge, do one calibration cycle: charge to 100%, use the phone until it shuts down on its own, then charge uninterrupted back to 100%. That resyncs the software's fuel gauge with the true capacity of the new 3,300mAh battery.
Reset AccuBattery's learned stats so it re-measures against the fresh cell, and re-pair the Bluetooth S Pen. This is a natural moment to trim background features too — a genuinely healthy battery plus fewer always-on services is what brings back usable Galaxy Note 8 battery life on hardware this age.
Repair vs. upgrade: keep the Note 8 alive (safely)
A new phone runs several hundred dollars. A Note 8 battery is roughly $15–$30 — and beyond the runtime, a fresh cell removes the real safety risk of running a phone on a worn, possibly swelling battery. The Note 8's AMOLED display and S Pen still do the job for calls, messaging, and light everyday use, so a cheap battery keeps a capable device out of the landfill. That's the heart of PhonePartPro: repair, don't replace — and when the phone truly is done, recycle it responsibly.
Get the Note 8 3,300mAh battery here, browse the full replacement batteries collection, or find your other devices in our guide to phone battery replacement by model.
FAQ
How much does a Galaxy Note 8 battery replacement cost?
About $15–$30 to do it yourself (the 3,300mAh cell is usually $12–$25) and $50–$85 at a repair shop. Manufacturer service is often unavailable for a phone this old, so DIY is both the cheapest and most reliable route.
How do I replace a Galaxy Note 8 battery?
Power off, heat the rear glass to soften the adhesive, open the back with a suction cup and picks, remove the bracket and charging coil, disconnect the battery flex, gently release the old cell's adhesive, install a new EB-BN950ABE battery, test, then re-seal. Plan on about an hour.
Why is my Galaxy Note 8 battery draining fast?
The Note 8's 3,300mAh cell was modest to begin with, and after eight-plus years it has lost much of its capacity, so it drains quickly and may shut down early. A fresh cell and a full calibration cycle restore normal runtime.
What size battery does the Galaxy Note 8 use?
3,300mAh at 3.85V, Samsung part number EB-BN950ABE, fitting SM-N9500, SM-N950B, SM-N950F, SM-N950U and SM-N950U1. Every Note 8 variant uses the same cell.
Is a swollen Galaxy Note 8 battery dangerous?
Yes — and it's common on a phone this old. A swelling cell can crack the curved glass back from the inside and poses a fire and puncture risk. Stop charging immediately, don't press or puncture it, and replace or recycle the phone right away.
Can I find a Galaxy Note 8 battery replacement near me?
Most local repair shops can do it same-day for $50–$75. If you'd rather DIY, order a quality zero-cycle 3,300mAh cell and follow the steps above — it's the same part a shop would install.