The Vivo Y20 battery model name is B-O5 according to the spare part sites that agree with each other, and the cell is rated around 5000 mAh typical. People type the code as BO5 or B05, but the proper form has a hyphen and the letter O, not a zero. The phone is sealed, so you can read the code only from the sticker on the cell, after a technician opens the back.
Below you will find how to confirm the code before you buy, which close cousins of the Y20 are listed with the same pack, and how to fit and look after it. The Y20 family has many names that look alike, and not every one carries the same battery. Check your own phone, not only the name.
Quick facts
Step by step
Write down the exact phone name and model number
Open Settings, tap About phone and note the name and model number. If you cannot find it, type model in the Settings search bar.
Compare the name with the box
The box carries the full name and model number. Match it with what the phone shows, because Y20, Y20i, Y20s and Y20G are separate phones.
Ask the technician to read the sticker
With the back open, the code sits on the label next to the capacity. It should read
B-O5. Do not pull or peel the pack yourself.Place old and new packs side by side
The code, size, weight and connector shape should all match. Refuse a pack that differs from the old one in any of these.
Vivo Y20 battery model name and what the label tells you
Vivo and iQOO batteries carry a short code made of B, a hyphen and two more characters. For the Y20, most listings name B-O5. The code page covers that pack in full, including codes that look like it: see B-O5 battery model name.
| Item | Detail | Status |
|---|---|---|
| Code | B-O5 | Agreed by most listings |
| Capacity | 5000 mAh typical | Same as the Y20's advertised figure |
| Voltage | About 3.85 to 3.87 V | Listings differ slightly; read your label |
| Rated capacity | Printed on the label, usually a little lower | Not confirmed here |
| Battery type | Sealed, not user removable | Opened only by a technician |
The code comes from listings and not from the box, so the sticker on your own battery has the last word.
Checking the Y20 battery code before you buy
Two things are easy to check without opening the phone. One is the model number under About phone. The other is the sticker on the box, which gives the full model name. Together they tell you which Y20 version you hold.
The code itself is read only from the pack. Ask the technician to show the old battery, or take a photo of its label. Compare it letter by letter with the new one. The letter O and the digit zero look almost the same in small print, so look hard at the third character: B-O5 and B-05 are different text, and a seller can mix them up. If the new pack shows anything other than B-O5, ask why before you pay.
Photograph the old label before the pack is discarded. If the first replacement turns out wrong, you can go back with the exact code.
Capacity of the Y20 battery: advert figure, label figure and daily use
The 5000 mAh number is what adverts quote, the typical value. Many makers print a slightly lower rated figure on the label, and that is the minimum the pack must meet. Read your sticker for it, as it can vary between batches.
To compare packs on energy, take the mAh, multiply by the voltage, then shift the decimal three places. Listings show about 3.85 to 3.87 V for this pack, which gives roughly 19.3 Wh. A replacement that boasts far beyond 5000 mAh in a pack of identical size is a red flag, because the cell has no room for it.
Battery life per charge changes with brightness, signal strength, installed apps and how worn the cell is. A fresh pack in this phone should carry normal use through a day, though your result will differ. The wider picture is in 5000 mAh battery phones.
Signs your Y20 battery is tired
| Symptom | Cause | Next move |
|---|---|---|
| Percentage falls fast through the day | Aged cell or a hungry app | Check apps first, then test the battery |
| Phone dies suddenly with charge still showing | Weak cell under load | Have a service centre test it and replace it |
| Screen lifts or the back shows gaps | Swollen cell | Unplug it and go to a service centre the same day |
| Body feels hot while untouched | Faulty pack or a background app | Restart, remove the case, get it checked |
Before blaming the pack, read about fast battery drain. To judge the pack itself, follow the battery health check.
A battery that is swollen, hot, leaking or dented can catch fire. Disconnect the charger first. Do not press or bend the pack. Take the phone to an authorised repair shop and keep it away from any heat on the way. Cheap copies showing inflated mAh figures are sold widely, so buy only a pack with the code B-O5.
Fitting a new pack and looking after it
The Y20 has a sealed body, so it is safer to let the brand's own service centre or a reliable repair technician swap the battery. Share the model number with them. Ask them to match B-O5 with the label printed on the old pack. You can find more advice on fitting in our mobile battery replacement guide.
A weak copy often gives itself away on the bench:
- It feels clearly lighter than the one you took out.
- The printing looks smudged, and you cannot spot any batch marking.
- The label promises well beyond 5000 mAh.
For daily care, avoid leaving the phone on charge all night, and keep it off hot spots such as a car dashboard or direct sun. Use the adapter that came with the phone, or one of the same rating. Heat and long hours sitting at full charge age a cell faster than ordinary use does. Other Vivo codes are gathered in the Vivo battery list.
Frequently asked questions
What is the Vivo Y20 battery model name?
Most listings give B-O5 for the Vivo Y20, a pack of 5000 mAh typical. Your own battery's sticker is the final proof, so have the technician read it.
Is the Y20 battery model BO5 or B05?
The proper form is B-O5, with a hyphen and the letter O. People type BO5 or B05, and the digit zero is a common slip. Match the characters on the label, not the typed form.
How many mAh is the Vivo Y20 battery model?
Vivo lists the Y20 with a 5000 mAh battery, and this is the usual number. The rated capacity printed on the pack could read slightly less.
Will the Y20 battery model fit Y20i or Y20s?
Several listings place B-O5 under the Y20i and Y20s as well, but this is not confirmed by the maker. Read the label on your pack, and check the connector before fitting.
Can I change the Y20 battery myself?
No. The body is sealed, and prying it open may harm the cell or the display cable. Let an authorised repair shop or a trusted technician do the job.
How can I tell if a Y20 replacement battery is fake?
A fake often feels light, has smudged print, shows no batch mark and promises far over 5000 mAh. Compare its weight and print with your old pack.