The Vivo V20 battery model name is B-N8, according to the listings that name this phone, and the pack is given as 4000 mAh typical at 3.87 V. Listings give B-N8 for the V20 Pro as well, so most sellers treat the two as sharing a cell. You will see it typed as BN8 or B N8, but vivo prints a hyphen after the B.
Treat the list as a strong pointer, not a final word. Your own phone may carry a different batch, and the V20 SE is a separate model with its own pack. Look at the label stuck to the old cell before you pay for anything, and use the steps below to confirm it.
Quick facts
Step by step
Write down the exact phone name
Open Settings and tap About phone. Write down what it says for name and model. If you cannot find them, type about in the Settings search bar.
Check the retail box
The box label repeats the phone name and model number. Compare it with the screen, because a V20, a V20 Pro and a V20 SE can look alike on a counter.
Have the old pack label read
The technician opens the back and reads the code on the cell sticker. You should see
B-N8along with a capacity and a voltage line.Match code and connector
Hold the new pack next to the old one. The code, the shape and the flat connector end must all agree before fitting.
Inspect the new pack
Look for clean print, batch details and a weight near the old pack's. A very light pack that claims a big capacity is a bad sign.
What the Vivo V20 battery model name tells you
vivo and iQOO cells carry short codes: B, a hyphen, then two characters. For the V20, listings give B-N8. The code names the pack, not the phone, so the useful question is which phones share it. The listings that mention B-N8 name the V20 and the V20 Pro together.
| Phone | Battery status | Note |
|---|---|---|
| Vivo V20 | Listed as B-N8 | 4000 mAh typical, 3.87 V |
| Vivo V20 Pro | Listed as B-N8 | Confirm on the old label |
| Vivo V20 SE | Unconfirmed for B-N8 | Separate phone; read its own sticker |
| Vivo V21 | Has its own page | Its own battery page applies |
The next phone in the series is covered on the Vivo V21 battery page, and every Vivo code is gathered in the Vivo battery list.
Capacity of the V20 battery in mAh and watt hours
The 4000 mAh figure is what adverts call the typical capacity. Vivo packs often print a rated (minimum) number too, and it can sit slightly below the typical one. This page does not guess that figure. Your own pack's label gives it.
To get B-N8's watt hours, multiply 4000 mAh by the voltage on its label and divide by a thousand. For this pack, 4000 times 3.87 gives about 15.5 Wh. Two packs with equal mAh but different voltage lines do not store the same energy, so compare both lines.
Daily use depends on far more than the battery. Display brightness, network signal, camera use and background apps all change the result. A 4000 mAh pack in a slim phone usually carries a normal day of mixed use, but heavy video or gaming cuts that short.
V20, V20 Pro or V20 SE: which phone do you hold
Search results for the V20 mix three phones that sound alike. Each has its own display, body and battery, so one sticker cannot be assumed for all three. The V20 SE is the one most often confused, because the name is so close, and its pack is not confirmed here.
A customer came in asking simply for "a V20 battery". The repair counter had a pack marked for the SE on the shelf, since the names looked close. With the V20 open, the technician read B-N8 on the old sticker and ordered exactly that. The SE pack might not have matched.
Check the name under About phone and on the box. If the name has SE or Pro in it, say so when you place the order.
Codes that look like B-N8
Short codes are easy to misread, so check each character. A faded sticker can turn N into M or H, and 8 into B or 6. Hold the label under strong light, or ask the technician to send a clear photo.
- The Redmi family has a code written BN8, with no hyphen. BN8 is a Xiaomi code with its own page, not the vivo B-N8.
- The vivo Y20 has its own cell and is unrelated to B-N8. See the Vivo Y20 battery page for that one.
- The code B-O5 has a letter O where B-N8 has an N. They are not the same pack.
Unsure how to read a vivo label? Our cell code guide shows where each brand prints it.
Signs that a V20 battery has aged
| V20 sign | Cause | B-N8 step |
|---|---|---|
| V20 percentage falls in steps | B-N8 worn after many cycles | Check V20 health, then plan a B-N8 |
| V20 dies at 20 to 30 percent | Weak pack cannot give peak current | Have vivo service test the B-N8 |
| Back panel lifts or a gap shows at the edge | Cell has gassed up | Unplug and visit a service centre today |
| V20 stays warm with the screen off | A runaway app, a bad cable or a tired B-N8 | Restart, remove the cover, then test |
Fast drain is often an app or signal problem first, so see reasons for fast battery drain. After that, run the steps for testing battery health and decide on a new pack.
A B-N8 that bulges, heats, leaks or dents could ignite. Disconnect the V20, avoid pressing on the cell and move it away from warmth. Take it for inspection at a service centre today. Cheap B-N8 copies often overstate capacity, so choose the exact code.
Fitting a new B-N8 pack and keeping it healthy
The V20 is sealed shut and B-N8 is not a home swap, so a trained technician should open it. Choose vivo service or a well regarded repairer, give them the V20 model number and have them check B-N8 against the old sticker. More on fitting is in the guide to replacing a mobile battery.
A copy B-N8 is easy to spot in the hand. The weight is off, the print is smudged, batch details are missing, and the capacity claim is much higher than 4000 mAh. No V20 sized cell can hold that much.
Ask to see the old B-N8 label before the cell is binned, and take a photo. If the new pack fails, you have the original code on record.
Each day, charge the V20 in a cool room, away from beds and sunny windows, and avoid leaving it full all night. Charge the V20 with its 33 W FlashCharge brick or an equivalent, and replace a cable that runs hot. Heat ages B-N8 faster than almost anything else.
Frequently asked questions
Which battery code does the vivo V20 use?
Listings give B-N8, rated 3.87 V and 4000 mAh typical. Read B-N8 on your old cell, since batches vary.
Is the Vivo V20 battery the same as the V20 Pro battery?
Most listings show the same code, B-N8, for both phones. Still, have the technician read the cell in your own V20 before ordering.
What capacity is the V20's B-N8?
The figure given is 4000 mAh typical. Your B-N8 may print a rated figure a little under 4000 mAh.
Does the Vivo V20 SE use the same battery?
This is not confirmed. The V20 SE is a separate phone, so do not assume B-N8 fits it. Match the code printed on its own pack.
Should I swap the V20 battery myself?
Better not to. B-N8 is glued inside a sealed V20, so a clumsy attempt risks the cell and the screen. Use vivo service or a repairer you trust.
Is the Xiaomi BN8 the same as vivo's B-N8?
No. BN8 without a hyphen is a Redmi family code, while B-N8 is the Vivo style. People drop the hyphen when typing, but the maker group is different.