The BLPA77 battery model name leads to the Oppo A3x range: the one parts listing available names the Oppo A3x 4G and the Oppo A3x 5G, with 5100 mAh at 3.91 V. Oppo is the maker, and the BLP prefix is the style seen on batteries made for Oppo, Realme and OnePlus handsets. That listing is a single source, so treat the match as likely and not final.
Shoppers spell this code differently, for example "blp a77 battery model name" or "blpa77 battery mobile model name". Every spelling means one and the same battery. The characters sit on the cell's own sticker, which a technician can read once the back of a sealed phone is lifted. Do not guess from the phone name alone, because Oppo sells several phones with A3 in the name and each one needs its own battery check.
Quick facts
Step by step
Write down the exact phone name and model number
Open Settings, tap About phone and note the device name. If you cannot find the model number, type model in the Settings search bar. Also check the 4G or 5G mark on the box.
Have the old battery label read
After the back is opened, the technician should read the code printed on the old sticker. It should say
BLPA77beside the capacity and voltage.Compare the new pack with the old one
Put both packs side by side. The code, the connector shape and the size should match, and the capacity should be close to the old figure.
Judge print and weight before fitting
A genuine pack has sharp print and batch details, and it weighs about the same as the old one. A very light pack that claims a bigger number is a red flag.
Which phones use the BLPA77 battery model name
The listing ties BLPA77 to two phones: the Oppo A3x 4G and the Oppo A3x 5G. It also mentions a China version of the A3x. That fits the usual pattern, where a 4G and a 5G version of the same phone body can share one battery. Still, one listing is thin evidence, so your own label has the last word.
| Phone | Status | Note |
|---|---|---|
| Oppo A3x 4G | Named in a parts listing | 5100 mAh, listed at 3.91 V |
| Oppo A3x 5G | Named in a parts listing | Same pack in the listing; read the label to be sure |
| Oppo A3x (China version) | Named in the listing | Left out of the fits list for this page |
| Other Oppo A3 phones | Not confirmed | Different name, so do not assume BLPA77 |
For other Oppo batteries, browse the full Oppo battery model list and choose your phone or code there.
Two capacity numbers for BLPA77: typical and rated
The 5100 mAh figure is what the listing gives, so read it as the typical capacity. Oppo packs usually carry a second, slightly smaller rated figure on the sticker. The rated value for BLPA77 is not confirmed, so your own label is the place to look.
To get energy in Wh, multiply the mAh by the voltage and divide the result by 1000. At 3.91 V, 5100 mAh comes to about 19.9 Wh. Two packs sharing a mAh figure but built for different voltages store a little different energy, so compare both numbers.
Hours of use in a normal day depend on the chip, the screen, signal strength and your apps, not just the mAh. How fast the phone charges is set by the charger wattage, so a new pack alone will not speed it up.
How to confirm BLPA77 before you buy
Searching "blp a77 battery mobile model name" gives a code, but the code on your own battery is the proof. The best moment to confirm it is when the back is already open for service. Ask the technician to read the sticker aloud, or to send you a clear picture.
Before the old pack goes in the bin, snap its label with your phone camera. Look closely at the characters that follow BLP. Worn print can make A look like 4, or 7 look like 1.
Then match three things: the code, the connector and the phone's model number. A pack with an equal mAh figure but another code may sit differently or plug in differently. The full routine is explained on the hub page for locating any phone's battery code.
Look-alike Oppo codes and similar phone names
Oppo codes are close in spelling, and a counter mix-up often comes from one changed character. BLPA79 and BLPA83 have their own pages, so open BLPA79 and BLPA83 before you accept a pack marked that way.
- The Oppo A3x and other A3 phones have similar names but are different models. Do not borrow a pack by name.
- BLP877 can look close to BLPA77 on worn print, but it is a different code.
- The BLPA17 page has a similar code format but its own phone list.
A technician at the counter held two Oppo packs of the same colour and size. One said BLPA77, the other BLPA79. The owner had an A3x 5G, and only the first matched the old sticker. Reading the last two characters took ten seconds and saved a second visit.
Signs your BLPA77 pack is wearing out
| Symptom | Possible cause | Next step |
|---|---|---|
| Charge level drops steeply in a morning | Ageing cell holds less than before | Check its health, then plan a swap |
| Sudden switch off around 20 percent | Tired cell cannot give peak current | Get the battery tested at service |
| Rear cover lifts or display edge rises | Swollen cell | Stop charging and visit service the same day |
| Phone gets warm while idle | Pack fault or a busy app | Restart it, remove the case, then get it checked |
Apps and a weak network signal cause many sudden drops. Before you spend any money, go through why a battery drains quickly. After that, use the steps in how to check battery health to find out how much life remains.
If the back panel lifts, the screen bulges, or the phone turns very hot, stop using it. Do not squeeze or poke the battery, keep the phone away from sunlight and flame, and hand it over to service. Cheap copies that boast a bigger mAh number often hide weak cells, so accept only a battery whose code matches exactly.
Fitting a new pack the safe way
The A3x is sealed, so the back should not be pried open at home. Visit an Oppo service centre or a workshop you know well. Hand over the phone, say whether it is the 4G or 5G version, and request a match of BLPA77 against the old sticker.
Hold a new BLPA77 up to the light and check for these signs:
- It feels clearly lighter than your old battery did.
- The print is smudged and batch details are missing.
- It claims much more than 5100 mAh, a number this physical size cannot honestly reach.
Ask for the old battery back, even if you will not use it, so you know it was changed. Read more on the mobile battery replacement page.
Day to day care for a 5100 mAh budget phone
Phones in this class are often charged overnight, and heat is what ages them fastest. Avoid charging on a bed or under a pillow, and take the case off if the back of the phone feels warm. Keeping the phone at 100 percent for long hours also adds wear.
Use the adapter from the box for charging, or a good one with the same watt rating. A cable that turns hot near the plug should be thrown away, and another one used. Say the phone dies too soon even after a restart and a full charge. In that case, get a service centre to test the cell before you buy a new one.
Frequently asked questions
Which phone uses the BLPA77 battery model name?
One parts listing matches BLPA77 to the Oppo A3x 4G and the Oppo A3x 5G, at 5100 mAh and 3.91 V. Because that is a single source, read the code on your old battery before ordering.
How many mAh is the BLPA77 battery?
The listed capacity is 5100 mAh, which is the typical figure. The rated (minimum) figure printed on the pack may be slightly lower, so read the sticker on the battery you hold.
Is BLPA77 the same as BLP877?
No. They are two different codes with their own phone lists. One extra letter or a changed digit can mean a different connector, so match the full code.
Can I use a BLPA77 battery in another Oppo phone?
Do not assume so. Only phones confirmed for the code should use it. Other A3 models are not confirmed, so check the label of your phone's old battery.
Where can I see the blpa77 battery mobile model name on my phone?
It is printed on the battery sticker, which you can see only with the back open. Settings may show capacity on some Oppo software, but the code itself is not shown there.
How do I spot a fake BLPA77 pack?
Fakes tend to be light, with fuzzy print, no batch details and a mAh claim well above 5100. Compare weight, print and connector with the old pack.