OnePlus 8 Battery Replacement: Cost & DIY Guide
A OnePlus 8 battery replacement costs roughly $50–$85 through a mail-in or authorized service, $50–$90 at a local repair shop, or about $15–$30 if you fit a quality replacement cell yourself. It is a DIY-doable repair for anyone comfortable opening a glued-glass phone, and it is the cheapest way to give a capable 2020 flagship several more years of daily use.
The standard OnePlus 8 was the compact, wallet-friendly member of the 2020 lineup: a flat 6.55-inch 90Hz AMOLED, Warp Charge 30T, and — unlike its Pro sibling — no wireless charging. Its 3300mAh battery was on the modest side for a phone with a high-refresh screen, so heavy users leaned on it hard. After a few years of daily fast-charging, that same cell is usually the one thing keeping an otherwise strong phone off the shelf. Here is how to confirm it, what a new one costs, and how to swap it yourself.
How to check your OnePlus 8 battery health
OxygenOS does not give you an iPhone-style "maximum capacity" percentage. Open Settings > Battery and you get usage graphs, per-app drain, and estimated screen-on time — genuinely useful for spotting a battery that empties faster than it should, but there is no built-in health score on this generation of OxygenOS.
For an actual capacity estimate, the honest tool is a third-party app. AccuBattery is what most OnePlus owners reach for: it measures how much charge flows into the battery while it charges and compares that to the original 3300mAh design figure. Set expectations correctly — it is an estimate, not a lab result, and it needs several full charge cycles before its number stabilizes. Once it has watched a few charges, an AccuBattery reading well under 80% of design capacity is a clear sign the cell is worn. Combine that with the everyday symptoms below and you will know whether it is time.
Signs your OnePlus 8 battery is failing
Wear arrives gradually, so look for a cluster of these rather than one bad day:
- OnePlus 8 battery draining fast — a charge that used to last all day is gone by early evening with the same routine.
- Warp Charge feels slower or hotter — a worn cell often will not hold its peak charge rate and warms up doing it.
- Sudden shutdowns at 20–30%, or the phone dying quickly in the cold.
- The phone runs warm during ordinary jobs like navigation or a long call.
- Slow or stalled charging — a OnePlus 8 battery not charging past a certain percentage, or not charging at all, usually means a dead cell once you have ruled out the cable and USB-C port.
Safety note on swelling: if the back glass or screen starts to lift, the phone rocks on a flat surface, or you see a visible bulge, stop using it. A swollen lithium battery is under pressure and can rupture or catch fire. Do not puncture it, do not keep charging it, and do not leave it in a hot car. Replace a swollen cell promptly and recycle the old one at a certified e-waste drop-off instead of binning it.
OnePlus 8 battery replacement cost
Your OnePlus 8 battery replacement cost depends almost entirely on who handles the labor. Here is the 2026 landscape:
| Option | Typical 2026 price | What you get |
|---|---|---|
| OnePlus / authorized service (mail-in) | $50–$85 | Genuine cell and labor, but limited US service coverage |
| Local repair shop | $50–$90 | Same-day walk-in labor, quality varies by shop |
| DIY with a replacement battery | $15–$30 (part) | The battery, adhesive, and about 45–60 minutes of your time |
OnePlus never ran the walk-in store network Apple does, so authorized service usually means mailing the phone away and going without it for days. That is what makes the DIY path so appealing on this model — you pay only for the part. Running several Android phones in a household or small business? Buying cells from a wholesale replacement battery supplier drops the per-unit cost even further.
The exact replacement battery you need
The OnePlus 8 uses a 3300mAh lithium-polymer battery — notably smaller than the 4510mAh cell in the 8 Pro, so do not cross-shop the two. Confirm any part is listed for the standard OnePlus 8, because the size and flex connector differ from both the Pro and the later 8T.
The phone shipped under model numbers IN2013 and IN2015 depending on region and carrier; you can check yours under Settings > About device. A genuine OnePlus 8 OEM battery is only supplied through OnePlus service, so for a DIY swap a high-quality aftermarket cell at the full 3300mAh spec is the practical option. Our catalog includes a zero-cycle 3300mAh lithium-ion cell at the same capacity — confirm OnePlus 8 fitment before you order — and you can always browse the full replacement battery collection for a matched fit that ships fresh from the US rather than a shelf-worn pull.
Replacing it yourself: step overview and difficulty
If you are wondering how to replace a OnePlus 8 battery, the process is orderly but it is a glued-glass entry, so patience matters:
- Power off and warm the rear glass evenly with a heat pad or hair dryer to soften the perimeter adhesive.
- Use a suction cup and thin picks to slice around the edge and lift the back glass — work slowly so you do not crack it or tear an internal flex.
- Remove the midframe screws and the plastic bracket, then disconnect the battery flex first.
- Release the battery adhesive — pull the stretch tabs slowly and evenly, or loosen stubborn glue with a little isopropyl alcohol. Never lever a stuck cell with a metal tool.
- Seat the new 3300mAh battery, reconnect everything, test before you re-glue, then reseal the back glass with fresh adhesive.
Honest difficulty rating: 6.5 out of 10. Without a wireless charging coil to work around, the OnePlus 8 is slightly friendlier than the 8 Pro, but the glued back glass and delicate ribbon cables still put it above an older, screwed-together phone. Budget an hour, work on a clean, well-lit surface, and keep the heat moderate so you do not scorch anything inside.
After the swap: calibration and warnings
Reassemble, power on, and confirm every function works. Two OnePlus-specific notes. First, OxygenOS does not throw an Apple-style "genuine part" lockout, so the phone just runs — but you should calibrate the battery gauge: drain the phone until it powers off, then charge uninterrupted to 100% and leave it a few extra minutes. That teaches OxygenOS the true endpoints of the fresh cell so the percentage readout stays honest. Second, if you use AccuBattery, reset its statistics so it starts learning the new battery from scratch instead of averaging against the old worn one. Give it a few cycles before you trust its estimate.
Repair vs. upgrade: the greener, cheaper call
A new flagship costs many hundreds of dollars. A replacement battery costs about the price of a takeout dinner. When the only real complaint about your OnePlus 8 is weak OnePlus 8 battery life, a fresh cell is the obvious call for your wallet — and for the planet.
The OnePlus 8 still has a crisp 90Hz display, a solid camera, and enough power for current apps; a tired battery is almost always the one fixable thing between it and another two or three years of service. Every phone kept running is one less device in a landfill and a little less mined lithium and cobalt. That is the entire idea behind repair over replacement — keep good hardware alive instead of throwing it away. For guides on other models, see our phone battery replacement by model hub.
FAQ
How much does a OnePlus 8 battery replacement cost?
Expect $50–$85 through OnePlus mail-in or authorized service, $50–$90 at an independent repair shop, or $15–$30 for the battery alone if you do it yourself. DIY is the cheapest route because you only pay for the part.
How do I replace my OnePlus 8 battery?
Power off, heat and lift the rear glass, remove the midframe bracket, disconnect and unstick the old cell, seat the new 3300mAh battery with fresh adhesive, test, then reseal the glass. It takes about 45–60 minutes and rates a 6.5 out of 10 for difficulty because of the glued back.
Why is my OnePlus 8 battery draining fast?
After several years and hundreds of Warp Charge cycles, the cell holds far less than its original 3300mAh, which was already modest for a 90Hz screen. Track it with AccuBattery over a few cycles — if the estimate sits well below 80% of design capacity, a replacement restores your battery life.
My OnePlus 8 battery is not charging — do I need a new battery?
Maybe. First rule out a bad USB-C cable, a worn charge port, or lint in the connector. If the phone still will not charge past a certain point or refuses to charge, a dead cell is the usual cause and a replacement fixes it.
Does OxygenOS show battery health like an iPhone?
No. This generation of OxygenOS shows usage graphs under Settings > Battery but no maximum-capacity percentage. Most owners use the third-party AccuBattery app, which estimates capacity by measuring charging across several cycles. Treat its number as a solid estimate rather than an exact reading.
Do I need a genuine OnePlus 8 OEM battery?
OnePlus only supplies its genuine cell through service, so for a DIY swap a high-quality aftermarket battery at the full 3300mAh spec is the practical choice. Pick a fresh cell matched to the IN2013 or IN2015 model rather than a used pull, and make sure it ships with adhesive.