The listing for the BLP855 battery model name pairs it with the Oppo Reno 6 Pro. That listing shows a pack of 2250 mAh at 7.74 V, which means two 2250 mAh cells joined in series. In plain phone terms this is the usual 4500 mAh class pack, at about 3.87 V per cell. It is an Oppo group part, the same group that puts BLP codes on Realme and OnePlus cells.
People type this code as "blp 855" with a space, and some search it hoping for a Realme or OnePlus phone. No source confirms any phone besides the Reno 6 Pro, so this page lists only that one. BLP855 is printed on the cell, and the sealed Reno 6 Pro needs a technician to open it before you can read it.
Quick facts
Step by step
Note the exact phone name and its model
Open Settings, tap About phone and note the device name and the model number. If you cannot see it, type model in the Settings search bar.
Have the back opened by a technician
The Reno 6 Pro is a sealed phone, so do not pry at it yourself. The technician lifts the back panel and reads the printed label on the pack.
Read two numbers, not one
On a dual-cell pack the label may show
BLP855with a figure like 2250 mAh and 7.74 V. Both belong to the same pack, so do not ask for a single cell.Compare the new pack with the removed one
Put them side by side. The code, voltage line, cable length and connector plug should all look the same.
Test the phone before closing the back
Ask the technician to power on, check charging and confirm the battery percentage reads normally before the cover is glued down.
Which phone has the BLP855 battery model name
BLP marks the Oppo group, and 855 identifies one specific two cell design. The only phone matched to it in the listings is the Oppo Reno 6 Pro, which has a sealed body and a dual-cell battery. BLP855 appears in only a few listings, so use this table as a start and check the cell itself.
| Phone | Status | Note |
|---|---|---|
| Oppo Reno 6 Pro | Matched by a listing | Shown as 2250 mAh at 7.74 V |
| Oppo Reno 6 | Unconfirmed for BLP855 | Different phone; read its own label |
| Oppo Reno 7 | Unconfirmed for BLP855 | Separate phone; read its own label |
| Realme and OnePlus phones | Not confirmed | BLP is a shared family, not a shared pack |
For the nearby phones, see the pages on the Oppo Reno 6 battery and the Oppo Reno 7 battery. The name Reno 6 covers more than one phone, so always say Pro when you ask for this pack.
Why the listing shows 2250 mAh and not 4500 mAh
This is the part that confuses buyers. Some Oppo phones with fast charging use two small cells inside one pack. When two cells are wired in series, the voltage doubles and the mAh stays the same as one cell. So 2250 mAh at 7.74 V is the same energy as 4500 mAh at 3.87 V.
Check it with the energy formula. 2250 times 7.74, divided by a thousand, gives BLP855 about 17.4 Wh. Multiply 4500 by 3.87 and you get the same result. Oppo adverts quote 4500 mAh, so take that as BLP855's typical capacity. BLP855 may also print a marginally lower rated figure; the cell has the final say.
A seller who lists the pack as 2250 mAh is not cheating you. A seller who lists a single-voltage pack at 4500 mAh for this phone may have the wrong design, so ask which voltage it carries.
How to confirm BLP855 before ordering
Work through these steps in order. First note the full name, including the word Pro. Then get the label read once the cover is off. Only then place the order or let the technician fit a pack.
- The code should read
BLP855in full. A pack ending in a different digit may look the same but can have another connector. - The voltage line should show a dual-cell value near 7.74 V. A figure near 3.87 V suggests a single-cell design.
- The connector and cable length should match the removed pack. Cables are short and fragile on this kind of pack.
A Reno 6 Pro owner whose phone died at 30 percent asked for a replacement of the same size. The counter had a pack with a similar shell but a code that ended in 85 instead of 855. The technician held both side by side, saw the cable plug was a different shape, and ordered the right code instead.
The full method for any phone is in our code finding guide.
Neighbouring BLP numbers that are not the same pack
Numbers close to 855 are tempting to swap in, because they sit next to each other on a parts shelf. Closeness in the number tells you nothing about the phone. Codes such as BLP851, BLP845 and BLP861 each serve their own phones and have their own pages here.
Two more habits cause wrong orders. People drop the BLP letters and type only 855, which then matches unrelated parts. And people write 855 when the pack says 885, since a blurred 5 and 8 look alike. The page for BLP885 shows how that other code is used. Tilt the label under strong light and read each digit twice.
Every Oppo, Realme and OnePlus code is gathered in the family hub.
Signs that a Reno 6 Pro pack is wearing out
| Reno 6 Pro sign | Probable fault | Next step for BLP855 |
|---|---|---|
| Reno 6 Pro percentage drops in jumps | One cell has aged more than the other | Run a health check, then book a test |
| Phone shuts down with charge left | Worn cells sag under load | Replace the pack at a repair counter |
| Fast charging slows or stops | Pack protection, hot phone or bad cable | Try another cable, then have it tested |
| Back panel rises or screen lifts | Swollen cell | Stop charging, see a technician today |
Before blaming BLP855, check apps and signal with our drain explainer, then follow the health check on the Reno 6 Pro.
Bulging, heat, leaking or dents make BLP855 a fire hazard. Unplug the Reno 6 Pro, never flex it, and set it away from heat. BLP855 fakes often claim more than the cells can hold, so accept only a pack printed BLP855 in full.
Fitting a BLP855 safely
The Reno 6 Pro back is glued, and BLP855 sits close to the screen and charging board. Heat and sharp tools are needed to open it, so leave the work to a technician with the right tools. Tell them the full phone name and ask them to read the label before they open the new pack.
A poor BLP855 copy shows these signs:
- It is clearly lighter than the BLP855 you removed.
- Lettering on the BLP855 is smudged with no batch line.
- The label claims a figure far higher than 4500 mAh for a pack of this size.
- Only one cell is visible, or the voltage line shows a single-cell value.
Ask the technician to power the phone on and check charging with the back still open. A fault found then costs nothing extra.
Our replacement guide covers sealed phones, and battery types explains two cell packs and voltage simply.
Looking after the pack between replacements
Fast charging is the main stress on a dual-cell pack, and heat adds to it. Charge the Reno 6 Pro in a cool room, remove a thick case when it warms, and skip gaming on the charger. Use the Reno 6 Pro's 65 W SuperVOOC charger or an Oppo approved one, with an unfrayed cable.
Leaving the Reno 6 Pro full for hours also wears BLP855. If you can, unplug once it reaches a high level. A pack that has aged will not recover, so if the percentage still jumps after a restart and a complete charge, get it tested instead of waiting.
Frequently asked questions
Which phone uses the BLP855 battery model name?
Most listings match BLP855 to the Oppo Reno 6 Pro. No other phone is confirmed for BLP855, so read your own cell before ordering.
What capacity is BLP855?
It is listed as 2250 mAh at 7.74 V, which is two cells in series. Together that makes the 4500 mAh class figure in adverts. BLP855's rated figure may be slightly lower.
Why does the BLP855 listing say 7.74 V?
A dual-cell pack adds the voltage of its two cells, about 3.87 V each. The mAh stays at the single-cell value, so the energy is the same as a 4500 mAh single-voltage pack.
Is BLP855 the same as BLP885?
No. They differ in one digit and may suit different phones. Blurred print makes 5 and 8 look alike, so read each digit twice under strong light.
Can I use a Reno 6 battery in a Reno 6 Pro?
Do not take it for granted. The phones are separate models and the packs are not confirmed as shared. Compare BLP855 character by character, then the plug.
How can I tell a BLP855 replacement is fake?
Fakes are lighter, with smudged print, no batch details and a claim well over 4500 mAh. Compare weight, BLP855 code and plug with the cell you removed.