The BN37 battery model name is the code that spare part listings give for two Xiaomi phones, the Redmi 6 and the Redmi 6A. BN37 is a 3000 mAh, 3.85 V polymer cell, close to 11.6 Wh. Both phones come from the Redmi range, so the maker group is Xiaomi.
People search for it as "mi 6a battery model", "redmi 6 battery model name" or "6a battery model name", and all of these lead to the same pack. Do not stretch the match to other Redmi 6 phones. No source ties the Redmi 6 Pro to BN37.
Quick facts
Step by step
Write down the exact phone name
Open Settings, tap About phone and note the device name. If it is not on the first screen, type model in the Settings search bar.
Compare it with the retail box
The box carries the model name and number. Redmi 6 and Redmi 6A look alike from the front, so do not go by the colour or the shape alone.
Have the old pack label read
After the technician lifts the back panel,
BN37should be printed on the cell sticker with the capacity and voltage. Do not try to peel or pull the pack out yourself.Hold old and new together
The new pack should show the same code, a close capacity and the same size and connector. Put the two on the counter side by side before fitting.
Weigh and inspect the new pack
Feel the weight against the old one, then look at the print for sharp letters and batch marks. A very light pack with a large mAh claim is a bad sign.
Phones behind the BN37 battery model name
BN marks the Xiaomi group of Redmi, Mi and POCO packs. They do not name a phone by themselves. Parts sellers agree BN37 fits two phones, the Redmi 6 and Redmi 6A. Searches that say "mi 6a" mean the Redmi 6A, which is how many people still call it.
| Redmi handset | Status | Note |
|---|---|---|
| Redmi 6 | Matched by listings | 3000 mAh, 3.85 V |
| Redmi 6A | Matched by listings | Same pack as the Redmi 6 in listings |
| Redmi 6 Pro | Not confirmed | Separate phone, so read its own label |
| Redmi 7 | Different phone | Has its own page and code |
If your phone is a Redmi 7, go to the Redmi 7 battery page and do not carry this match across.
Redmi 6A, Mi 6A and Redmi 6 are one pack, not three
Buyers often think each name needs its own battery. For these two real phones, listings show one code and one capacity. A listing for "Mi 6A battery" and another for "Redmi 6 battery" are usually describing the same BN37 cell.
The real risk is the other direction. The Redmi 6 Pro and other Redmis with nearby numbers may carry a different cell. Have the repairer read the model from the box or About phone and match it to BN37.
One owner brought in a Redmi 6A that died at 30 percent and asked for "the 6 battery". The counter first pulled a pack for a different Redmi. Opening it, the technician read BN37 on the old cell and ordered exactly that. The wrong pack was never fitted.
Capacity of the BN37: what 3000 mAh really means
The 3000 mAh figure is the one used in listings and in the maker's phone specification. Xiaomi stickers often add a rated minimum just below the 3000 mAh headline. Take the rated number from the pack in your hand, since it may differ between batches.
3000 mAh at 3.85 V gives about 11.6 Wh for BN37. With 3.85 V, 3000 mAh gives 11.55 Wh. Comparing mAh alone between two packs can mislead you when the voltage differs.
On an entry-level phone like these, 3000 mAh usually carries a day of light use. Signal strength, brightness and heavy apps change that a lot, so treat any hours figure as a rough guide.
Look-alike codes near BN37
Codes close in number are not close in phones. On the parts shelf, BN36 and BN47 sit beside BN37, each with its own phone list. Match by the full code, never by the digits.
- Two packs can both read 3000 mAh and still differ in size, connector and code.
- Faint print makes 3 and 8, or 7 and 1, hard to tell apart. Angle the BN37 sticker towards a bright lamp.
- Do not accept a pack that says only "Redmi" with no code at all.
The entire Xiaomi family is tabulated in our Redmi code roundup.
Signs your Redmi 6 or 6A battery is wearing out
These phones are old, so many BN37 packs have gone through hundreds of charge cycles. Use the table to read the signs.
| Redmi 6 symptom | Likely reason | Next step for BN37 |
|---|---|---|
| Percentage drops in big jumps | Worn BN37 misreports charge | Test the Redmi 6, then plan a BN37 swap |
| Phone switches off at 25 to 30 percent | Tired BN37 cannot give peak current | Have BN37 tested |
| Back cover lifts or the seam opens | BN37 has swollen | Unplug the Redmi 6 and go today |
| Redmi 6 warm while idle | Faulty pack or runaway app | Restart, take off the cover, test |
For a Redmi 6 that drains fast, our drain fixes come first and the battery health steps second.
A BN37 that swells, heats strongly, leaks or dents may ignite. Cheap copies often carry a made-up capacity, so fit only a pack whose code is exactly BN37.
Getting a replacement fitted
Both phones have a closed body, and the pack is fixed in place, so the job belongs to a technician. Visit Xiaomi service or a repairer you already rely on. Say "Redmi 6A, BN37" and have them hold the new cell against the old.
Spotting a poor copy takes a minute:
- It weighs clearly less than the pack you removed.
- BN37 lettering is smudged with no batch details.
- It claims far more than 3000 mAh in the same small body. No honest cell of that size can do this.
Our replacement walkthrough covers fitting on the Redmi 6 and other phones.
Ask for the old pack to be shown to you before it is binned, and take a photo of its sticker for your records.
Keeping an older BN37 pack going longer
A Redmi 6 or 6A is often a second phone or a phone for an elder at home, and it sits on charge for hours. BN37 cells in the Redmi 6 suffer most from summer heat and nights spent at 100 percent.
The Redmi 6 and 6A shipped with 10 W micro USB chargers, which suit this small pack well. Lower screen brightness and close unused apps to ease the load on a tired cell. Once a Redmi 6A has been restarted and topped up yet still quits early, a BN37 is usually the cure.
Frequently asked questions
Which phone has the BN37 battery model name?
Listings match BN37 to the Redmi 6 and the Redmi 6A. The pack is given as 3000 mAh at 3.85 V. The BN37 print on your old cell settles it.
What is the Mi 6A battery model number?
People who type Mi 6A usually mean the Redmi 6A, and listings give its battery as BN37. The same code is given for the Redmi 6.
How many mAh is the Redmi 6A battery?
The pack is given as 3000 mAh. Your BN37 sticker may also show a slightly lower rated figure.
Is BN37 the Redmi 6 Pro battery too?
That is not confirmed. The Redmi 6 Pro is a different phone, so read the code on its old pack and do not assume it shares BN37.
Can I fit a BN36 or BN47 in place of BN37?
Do not assume that. The codes belong to different phone lists, and size or connector may differ. Match the complete code.
How can I tell a fake BN37 battery?
A fake BN37 feels light, prints blurrily, lacks batch marks and claims far above 3000 mAh. Check weight and code against the Redmi 6's original cell.