The BN45 battery model name points to one phone in most listings: the Redmi Note 5 Pro, made by Xiaomi. The pack is listed at 4000 mAh typical and 3.85 V, which works out to about 15.4 Wh. Outside India this phone was sold under a different market name, so some listings use that name instead.
Some users type this code as "mi note 5 pro battery model" or as "bn 45" with a gap. Each of these points to one and the same pack. Be careful with the ordinary Redmi Note 5, since that was a different handset in India, and nothing here confirms that its battery is BN45. A technician must open the back cover first, because only the label on the pack itself shows the code.
Quick facts
Step by step
Write down the full phone name and model number
Open Settings and tap About phone. Note the device name and the model number. If you cannot see it, type model in the Settings search bar.
Compare with the box or bill, if you still have them
The box carries the phone name and model number. A plain Redmi Note 5 and a Redmi Note 5 Pro look alike in many listings, so match the full name, including the word Pro.
Have the technician read the sticker on the old pack
Once the back is opened,
BN45sits on the label along with the capacity and voltage. Ask for a clear photo of it before the old pack goes in the bin.Place old and new packs side by side
The code, capacity, size and connector end should match. If the code differs by even one character, stop and ask why.
Judge the new pack by weight and print
A sound pack has sharp print, batch marks and a weight near the old one. A very light pack that claims far more than 4000 mAh is a bad sign.
Which phone uses the BN45 battery model name
Xiaomi starts many Redmi and POCO pack codes with BN, but those two letters point only to the maker group, never to one phone. For BN45, most listings name the Redmi Note 5 Pro. That is the phone sold in India under this name.
| Phone | Status | Note |
|---|---|---|
| Redmi Note 5 Pro | Matched by listings | 4000 mAh typical, 3.85 V |
| Redmi Note 5 (India) | Not confirmed | Probably a different pack; see the BN44 page |
| Redmi Note 7 and Note 8 | Different codes | Not BN45 phones |
Some sellers write "Redmi Note 5 and Note 5 Pro" in one line, which blurs the picture. Your own old label is the final word.
Note 5 Pro battery model name: the Pro and non-Pro mix-up
A buyer who asks for a "note 5 pro battery model name" often gets a pack meant for the plain Note 5, because listings often show both together. In India the Redmi Note 5 and the Redmi Note 5 Pro were two separate phones launched close together, and their batteries should not be assumed the same. For the plain Note 5, open the BN44 page and compare the phone list there.
A customer brought in a Note 5 Pro that drained by afternoon and kept restarting. An earlier repair had used a pack sold for "Note 5". The technician read BN45 on the label of the old pack, ordered that exact code, and the restarts stopped after the swap.
4000 mAh: typical figure, rated figure and watt hours
The 4000 mAh number is the usual capacity that sellers and brochures quote. Some Xiaomi packs show a smaller, minimum value on the label as well. That rated number for BN45 is not clear in listings, so look at your own pack instead of trusting a seller's word.
Watt hours come from mAh times volts, over 1000. For BN45, 4000 mAh at the listed 3.85 V gives 15.4 Wh. Packs that share the same mAh but run at different volts store different energy, so compare both numbers.
How long the phone lasts depends on screen brightness, how strong the network is, which apps you open, and the age of the cell. An old phone with a tired pack will give much less than 4000 mAh when you use it daily.
Codes that look close to BN45
Xiaomi codes run in families, and several sit next to BN45 in the same price range. At a busy counter, a faded sticker makes them easy to confuse.
- BN44 is one step lower. Check its page for its own phone list before you assume anything.
- BN46 and BN48 are often listed near BN45, and some seller titles bundle them with it. Each has its own phones.
- BN31 is another common code that appears in the same multi-code titles.
A bundle title does not make the codes interchangeable. Choose the pack whose printed code equals yours exactly. Every family page is gathered in the full table of Redmi and POCO battery codes.
Signs that a BN45 pack is tiring
| Symptom | Probable cause | Response |
|---|---|---|
| Percentage falls fast after unplugging | Cell holds only part of its original charge | Test the battery, then plan a new pack |
| Switch-off while the screen still reads 15 to 30 percent | Aged cell sags when the phone draws power | Get the pack tested at a service point |
| Back panel or screen edge lifts | Cell is puffing up | Unplug at once and go to service |
| Charging is very slow or stops | Dirty port, bad cable or weak pack | Try another cable, clean the port gently, then test |
Wear is normal in a phone of this age. Apps and weak signal can also drain the charge fast, so go through why a battery loses charge quickly before you blame the pack. When you want to test the pack itself, open the battery health check page.
Check for three warning signs: a bulging battery, warmth even when the phone is not in use, or an odd smell. If any one shows up, unplug the cable right away and leave the handset alone. Do not squeeze the battery, and do not try to open the body with a tool. Keep the phone far from flames and hot spots, and hand it over to an authorised repair shop immediately. Lots of low-grade copies claim a bigger capacity, so always ask for the exact code when buying.
Fitting a new BN45 pack
The Note 5 Pro has a sealed body, so the pack is not meant to be swapped at home. Hand the phone to the maker's authorised service team or a technician you know and trust. Give the exact phone name and request that they check BN45 against the label on the old pack.
Before the back goes on, ask the technician to check three things:
- The new pack reads BN45 and nothing else.
- The connector end has the same shape as the old one.
- The pack sits flat, with no bulge and no torn wrapper.
For the wider routine, see mobile battery replacement.
Once the new pack is in, give it one full charge and then use the phone as usual. If it still shuts down early, the fault may be on the board or in a bad cable, not in the new pack.
Looking after an older Note 5 Pro battery
A phone this age has been through many charge cycles, so small habits matter more now. Avoid charging while gaming or recording video, because heat wears a cell fastest. Never park the phone in a hot car or tuck it beside bedding while it charges.
Choose a cable and charger without damage. A frayed cable may get hot near the plug and give the phone uneven power. If the phone is only for calls and messages, switch off background sync and reduce the screen brightness. This saves more than any cleaning app. Staying between roughly 20 and 80 percent charge is kinder to an old cell, though you need not follow it strictly.
Frequently asked questions
Which phone has the BN45 battery model name?
Most listings match BN45 to the Redmi Note 5 Pro. The pack is listed at 4000 mAh typical and 3.85 V. Confirm it on your old label.
What is the Mi Note 5 Pro battery model?
Most listings give BN45 as the battery for the Redmi Note 5 Pro. People often type Mi in place of Redmi, but the phone is a Redmi. Check the sticker on your pack to be sure.
How many mAh is the BN45 battery?
Listings give 4000 mAh typical, which is about 15.4 Wh at 3.85 V. The minimum figure printed on your pack may be a bit lower, so read your own print.
Is the BN45 battery the same as the Redmi Note 5 battery?
Do not assume so. The plain Redmi Note 5 in India and the Note 5 Pro were different phones, and the Note 5 pack is not confirmed as BN45. Match the full phone name and the code.
Can I use a BN46 or BN44 pack instead of BN45?
No. A different code can come in another size or with another connector, even if the mAh is nearly the same. Match the code printed on the old pack that you took out.
How do I spot a fake BN45 battery?
Fake packs are often lighter than the original, with smudged print, missing batch marks and a claim well above 4000 mAh. Compare the new pack with the removed one for weight, print and connector.