The Redmi Note 8 battery model is BN46, and spare listings give its capacity as 4000 mAh typical. Listings for the Redmi Note 8T show the same code. The maker group is Xiaomi, and the letters BN only point to that group, not to the exact phone.
People also type this as "mi note 8 battery model name" or "note 8 battery model". Xiaomi sold this phone as the Redmi Note 8, so use that full name while ordering. The Note 8 Pro is a different handset altogether, with a bigger battery and its own code, so keep the two apart at the counter.
Quick facts
Step by step
Confirm you own a Redmi Note 8, not a Pro
Open Settings, tap About phone and read the device name. If you cannot see it, type about in the Settings search bar.
Photograph the box label
The box carries the phone name and model number. Keep a photo of it, because it settles any argument about variants.
Let the technician read the old sticker
The code
BN46is printed on the battery label after the back is opened. Request a picture of that label instead of pulling the pack out yourself.Compare the new pack with the old one
Check the same code, a similar weight, the same size and the same connector. Put the two packs side by side before the new one is fitted.
The answer for the Redmi Note 8 battery model
Spare part listings match the Redmi Note 8 to one battery code, BN46. They give it as a 4000 mAh pack, which is the headline number in adverts. Some Xiaomi packs carry a rated number that sits a little under the advert figure. Read that rated number from your own battery before you buy.
The detail page for the code, with look-alikes and fitting notes, is the BN46 battery model name page. This page stays with the phone and what you should do before you buy.
How to see the battery code on your phone
This phone is sealed, so the code appears only on the battery sticker. You will not find it in Settings. That menu shows the device name and model number, and a technician uses those to look up the right battery.
- The box usually shows the phone name, memory version and model number.
- The sticker on a loose, removed battery carries the code, capacity and batch print.
- An old repair slip or invoice may also list the part.
Other ways to trace a code are covered, in order, in the battery model name finder guide.
What 4000 mAh gives you in daily use
Capacity is only half the story. Energy in watt hours comes from the pack voltage as well: take mAh, multiply by volts, then divide by 1000. Your label shows the voltage, so read it there and do the sum yourself.
How long the screen stays on for a Redmi Note 8 in daily use varies with brightness, signal quality, background apps and how worn the cell has become. A fresh battery should normally last a regular user all day. A worn battery that has gone through many charge cycles holds far less than the capacity written on it. If your phone dies fast, go through the reasons for quick battery drain before paying for anything.
Signs your Note 8 pack is worn out
| What you notice | Usual cause | What to try |
|---|---|---|
| Percentage drops quickly after you unplug | Ageing cell with reduced capacity | Check battery health, then look for a new pack |
| Phone switches itself off with charge still showing | BN46 cannot supply enough current | Get the battery tested |
| Screen rising from the frame | Pack is swelling inside | Stop charging and get it seen at once |
| Charging is very slow | Damaged cable, dirty port or weak cell | Swap in a different cable, then test the battery |
The battery health check guide helps you tell a worn pack from a software problem.
A bulging back panel, a lifting screen or a phone that stays very hot when idle means danger. Stop charging, leave the phone alone without pressing it, keep it away from sun and heaters, and take it for service the same day. Fake replacements carrying exaggerated mAh claims are everywhere, so insist on the exact code.
Buying and fitting a replacement
The Redmi Note 8 is held shut with adhesive, so prying it open at home puts the display, flex cables and cell at risk. Go to an official service point or a shop you trust. Tell the technician the phone name from the box and ask them to match BN46 with the old label.
Warning signs on a new pack:
- It weighs clearly less than the old one.
- The printing looks blurred and no batch detail is shown.
- It promises far above 4000 mAh in the same body.
More tips on the whole process are in the mobile battery replacement guide.
Ask for a look at the new pack before the back goes on, and keep a picture of its label for your records.
Daily habits that keep this pack healthy
Warmth is the biggest enemy of an older Note 8. Do not charge it on a bed, in a car parked in the sun or with a thick case that traps heat. Keep a good cable, since a frayed one can slow charging and run hot at the plug. Stay with the original adapter or one of equal rating.
Avoid leaving your phone plugged in and full through the whole night, and do not let it run down to empty over and over. Such simple care helps any lithium cell wear out more slowly.
More Redmi batteries to compare
If you came here while comparing several phones, the Redmi battery model list shows every code on this site in one place. The Redmi Note 7 page is the one to open if you own the older phone, since the two look alike but do not share a pack.
Frequently asked questions
What is the battery code of the Redmi Note 8?
The code is BN46. Sellers list it as a 4000 mAh typical battery. Check the label printed on the battery in your phone to be sure.
Is there a Mi Note 8 battery model?
There is no phone sold here as the Mi Note 8. People mean the Redmi Note 8, so ask for BN46 by that phone name.
Does the Redmi Note 8T use the same battery?
Listings match the Note 8T to BN46 as well. The label on the old pack is the final proof.
Can I put a Redmi Note 8 Pro battery in a Note 8?
No. The Pro has a larger pack and its own code. Match the exact code and connector.
What is the mAh of the Redmi Note 8 battery?
Sellers state 4000 mAh as the typical figure. The smaller rated number on your own label could be slightly less.
Can I change the Note 8 battery at home?
That is a poor idea. The adhesive back and the cell near the display cables make it easy to cause damage. Use a service point or a shop you trust.