Sellers usually match the BN52 battery model name with the Redmi Note 9 Pro and its bigger Pro Max sibling, each at 5020 mAh typical. BN52 is a Xiaomi part, the group behind Redmi and POCO handsets. Some listings sell BN52 and BN53 together as one pair, so the two codes are easy to confuse, and the exact phone list is not as clean as it is for newer codes.
People type this code as "bn 52 battery model name" or just "bn52 battery". The code sits on the label stuck to the Note 9 Pro cell. On these phones the back is glued, so only a technician can reach it. Until you read that label, treat every BN52 list, this one included, as a lead.
Quick facts
Step by step
Note the full phone name and its model code
Open Settings, tap About phone and copy the device name and the model entry. If it is not on the first screen, type model in the Settings search bar. The retail box also carries it.
Have the technician read the label on the fitted pack
Once the back is lifted, the sticker shows the code, capacity and voltage. Ask for a clear photo of it before anything is removed.
Decide between BN52 and BN53
If the sticker says
BN52, order BN52. If it saysBN53, order BN53. Do not accept one for the other just because both appear in the same advert.Compare the new pack side by side
Check the code, capacity, connector shape and weight against the pack that came out. Refuse a pack that differs in any of these.
Which phones use the BN52 battery model name
The BN prefix recurs across Redmi and POCO cells and tells you only that Xiaomi made it. Sellers who name phones for BN52 give the Note 9 Pro and Note 9 Pro Max, both with a 5020 mAh cell. Other listings put BN52 and BN53 on one product page, which suggests the two codes serve a family of closely related phones.
| Phone | Status | Note |
|---|---|---|
| Redmi Note 9 Pro | Named by most BN52 listings | 5020 mAh typical for BN52 |
| Redmi Note 9 Pro Max | Most BN52 listings name it | BN52 at 5020 mAh typical |
| Redmi Note 9S | Not confirmed | Read the label first |
| POCO M2 Pro | Not confirmed | Some listings give BN53 for it |
| Redmi Note 10 Pro | Listed under BN53 | Do not treat as BN52 |
Starting from the phone instead? For the handset view, open our Note 9 Pro battery page; the neighbouring code has its own BN53 page.
Why BN52 and BN53 get sold together
Walk through parts listings for these phones and you will sometimes see the two codes written with a slash between them. Sharing a capacity class does not make BN52 and BN53 one pack. Often it means the seller has one product photo for a group of phones, and the buyer must still pick the right one.
The two packs are listed with similar capacity, which is why the confusion is common. Similar is not identical. A connector position or a small shape change can make a pack that looks right sit wrongly in the tray. The safe rule is simple: the code on the pack you are replacing decides the order, not the phone name alone.
A customer brought a Note 9 Pro Max and asked for the BN53 pack because an advert showed it next to the phone photo. The technician opened the back, found BN52 on the fitted cell and ordered that code. The mistake was caught before any glue was cut.
What 5020 mAh means: rated against typical
BN52's 5020 mAh is the typical figure in Note 9 Pro adverts. Xiaomi packs often print a lower rated (minimum) value on the label too. BN52's rated value is unconfirmed, so read your own Note 9 Pro label.
BN52 energy in watt hours is 5020 mAh times the label voltage, divided by a thousand. If your label shows 3.87 V, then 5020 mAh gives roughly 19.4 Wh. If your label shows another voltage, use that one. A Note 9 Pro Max cell at a different voltage would store a different amount even with the same mAh.
How long a Note 9 Pro lasts depends on far more than BN52. The display, network signal, brightness and background apps all change screen-on time, and the charger and cable decide how long a full charge takes.
Neighbouring codes and similar phone names
The usual trouble is a neighbouring number, not a wrong letter. Check BN53 and BN54 for their own phones before trusting either in a Note 9 Pro.
BN53is listed mostly for the Redmi Note 10 Pro and POCO M2 Pro. Compare it on the Redmi Note 10 Pro battery page.BN54is listed for a different set of phones, so a close capacity does not make it a fit.- The Note 9, 9S and 9 Pro share a name stem yet are three distinct phones. Match the full name on the box.
When the sticker print is faint, 2 and 3 can look the same. Shine a lamp across the BN52 label or ask the technician for a sharp photo. Every Xiaomi family code sits together on the Redmi, Xiaomi and POCO battery hub.
Warning signs of a tired pack
| Note 9 Pro symptom | Usual fault | Next step for BN52 |
|---|---|---|
| Percentage drops in big jumps | BN52 worn after many cycles | Test Note 9 Pro health, then plan a BN52 |
| Note 9 Pro Max quits with 20 to 30 percent showing | BN52 cannot give peak current | Have a technician test BN52 |
| Note 9 Pro screen lifts or back gaps | Swollen cell | Unplug the Note 9 Pro and go that day |
| Note 9 Pro warm while idle | An app hogging power, or BN52 near its end | Restart the Note 9 Pro Max, drop its cover, test BN52 |
Rule out software first with our drain troubleshooting page. After that, test the pack itself using the battery health check steps.
Should the BN52 swell, heat, leak or dent, disconnect the Note 9 Pro immediately and leave it on tile or stone well clear of anything warm. Do not press, bend or pierce it. Copies often print an inflated capacity, so accept a new pack only when its code is identical to the one you removed.
Fitting a BN52 safely
The Note 9 Pro back is glued down, and BN52 sits beneath the board in a tight space. Cutting glue and lifting a cell without training can bend it. Book the job at the brand's authorised service centre or with a repair shop you trust, and hand over the phone name, its model code and the battery code.
A weak BN52 copy shows these signs:
- It is noticeably light in the hand next to the pack that came out.
- BN52 lettering smears without batch details.
- It claims far above 5020 mAh, beyond what a Note 9 Pro cell can hold.
For more on fitting, read our swap guide.
Ask to keep the old pack until the phone has run a full day on the new one. If something is off, you still have the original code to compare.
Care for BN52 in the Note 9 Pro
A big pack that charges quickly can run warm, and heat is the main thing that shortens its life. Charge the Note 9 Pro on a firm surface, remove a heavy cover if it warms, and avoid gaming while it charges.
Charge the Note 9 Pro with its boxed 30 W adapter and cable or an equal unit. Retire any cable whose plug turns hot on the Note 9 Pro. Sitting at full charge for hours also adds wear, so unplug when you can. A Note 9 Pro Max that keeps shutting off early after a restart and full charge should have BN52 tested before you buy.
Frequently asked questions
Which phone has the BN52 battery model name?
Listings naming phones for BN52 give the Note 9 Pro and Note 9 Pro Max, both 5020 mAh typical. Read the label on the fitted pack to be sure.
What capacity is BN 52?
Listings give 5020 mAh typical. Your BN52 label may print a lower rated minimum.
Is BN52 the same as BN53?
No. They are sold together in some listings, but they are two codes. Order whichever code is printed on your fitted pack.
Can I fit a BN53 pack in a phone that needs BN52?
Do not assume it will fit. Similar capacity does not guarantee the same shape or connector. Match the full code with the label first.
Is the Redmi Note 9S battery BN52?
That is not confirmed. The Note 9S is a close cousin of the Note 9 Pro, but listings disagree on its code, so read the label.
What gives away a fake BN52?
A fake BN52 tends to be light, smudged, missing batch marks and far above 5020 mAh. Weigh and compare the code against the original pack.