The BLP685 battery model name points, in most listings, to the OnePlus 6T and the OnePlus 7. BLP685 appears in listings as a 3700 mAh typical polymer cell rated 3.85 V. BLP is an Oppo group prefix, and OnePlus phones of that era use the same family.
Some people see BLP685 and guess it belongs to a Realme C-series budget phone, because a few mixed listings may group it with those models. Do not trust that. The pack is a slim, flat cell for a glass-backed flagship, and it is not a 5000 mAh cell. Read the label on the pack you removed before you pay for anything.
Quick facts
Step by step
Write down the exact phone name
Open Settings, tap About device and note the name and model number. If you cannot find it, type model in the Settings search bar.
Separate the 7 from the 7 Pro and 7T
The OnePlus 7, 7 Pro and 7T look alike in name only. Make sure the name says plain 7 or 6T, because the Pro and T versions are not matched to this code here.
Have the technician read the old sticker
On a glass-backed phone the back must be lifted with heat and care. Once it is open,
BLP685should be printed on the cell label with its capacity and voltage.Compare the new pack before fitting
Check the code, the capacity range, the connector and the outline. A pack that is thicker or thinner than the old one is the wrong part.
Phones that take the BLP685 battery model name
Most listings name two phones for this code: the OnePlus 6T and the OnePlus 7. The 6T and 7 have similar screen sizes and the same 3700 mAh claim, which supports a shared BLP685. Even so, confirm your exact model number before buying.
| OnePlus handset | Status | Note |
|---|---|---|
| OnePlus 6T | Matched by most listings | Given as 3700 mAh typical, 3.85 V |
| OnePlus 7 | Matched by most listings | Confirm the model number first |
| OnePlus 7 Pro, OnePlus 7T | Not confirmed | Different phones, read the label |
| Realme C11, C12, C15 | Doubtful | Not a trusted match, check the label |
The Realme C-series packs belong to other codes. For one that is often confused with this one, see BLP793.
Do not use BLP685 in a Realme C-series phone
A mixed replacement listing may put BLP685 and BLP793 in one title and then list Realme C11, C12, C15 and Narzo phones beside them. That is a lazy bundle of unrelated cells. A 5000 mAh budget phone and a 3700 mAh flagship cannot share one pack, because the case size and the connector are different.
If you own a Realme and the seller shows BLP685 for it, stop. Ask the seller to show the code printed on your removed pack. The family hub at Oppo codes and phones helps you find the real code for your phone.
A customer with a OnePlus 6T was shown two packs from one box. Both said BLP, and one said 5000 mAh. The technician held each against the removed pack, saw that the bigger one did not match the outline, and fitted the one printed BLP685 only after the connector lined up.
Rated and typical figures for this cell
BLP685's 3700 mAh is the typical figure in OnePlus 6T and 7 adverts. One seller shows 3610 mAh, likely the rated value on the BLP685 label. Both fit the same BLP685, so treat 3700 as the headline and read the rated figure from your cell.
BLP685 energy: 3700 mAh times 3.85 V, divided by a thousand, is about 14.2 Wh. At 3.85 V, 3700 mAh is roughly 14.2 Wh, and 3610 mAh is roughly 13.9 Wh. A listing that claims 5000 mAh for this pack but only a few watt hours more has numbers that cannot agree with each other.
A OnePlus 7's day depends on its display, reception, brightness and the apps running. With BLP685, a 6T usually gets through an ordinary day, but heavy gaming means a top up before evening.
Look-alike codes near BLP685
The BLP numbers run close together, and a counter shelf often holds several. A close number never means the same phone, so do not choose a pack because its code is near BLP685. Always match the full code printed on your old pack.
- BLP793 has its own phone list and is not a swap for BLP685.
- BLP673 is another code with separate phones.
- The digits 6 and 8 blur on a worn sticker. Tilt it under a bright lamp or take a close photo.
When two packs look alike, the connector position and the outline decide, not the number alone.
Signs a BLP685 pack is wearing out
| OnePlus 6T or 7 sign | Behind it | Next step for BLP685 |
|---|---|---|
| 6T percentage drops in jumps | Aged BLP685 misjudges charge | Check battery health and book a swap |
| OnePlus 7 dies at 25 to 30 percent | Tired BLP685 under load | Have OnePlus service test the BLP685 |
| 6T screen lifts or back gaps | BLP685 has swollen | Unplug the 6T and get it seen today |
| Warm when idle | Fault or a busy app | Restart the 6T, remove its case, check the cell |
Check apps and signal first with our drain page, then use the health steps to judge BLP685.
If the cell is swollen, hot, leaking or dented, unplug the charger at once. Keep your hands off the swollen 6T cell and well away from any heat source. Bring the OnePlus to a service counter. BLP685 fakes with inflated labels are a real risk, so buy only a pack printed BLP685 in full.
Fitting a new pack on a flagship body
The OnePlus 6T and 7 have glued glass backs, with BLP685 under the board and cables. Cracked glass, torn flex cables and a pierced cell are common when someone tries this at home. Let OnePlus service or a repair shop you know well open them.
Check these points on any new BLP685:
- The weight is near that of the pack you removed, not far lighter.
- The print is sharp and shows batch details.
- The label capacity is near 3700 mAh. A figure far higher is not honest for this size.
More general steps are on the replacement guide.
Ask the shop to keep the removed pack until you have tested the new one for a day. Photograph its label first.
Everyday care for an older flagship battery
A OnePlus 6T this old has been through many cycles, so heat is BLP685's main enemy. Keep the charging OnePlus 7 indoors on something hard, away from parked car heat, sun and bedding, and pull off any chunky cover once it warms. Use the 20 W Dash charger from the box or a good equivalent, and bin any cable with a scorched or loose plug.
Unplug when it is full if you can, and do not leave it at full charge for days. If the 6T keeps shutting down after a restart and full charge, BLP685 is the likely culprit. Our label reading guide shows other ways to find a code.
Frequently asked questions
Which phone has the BLP685 battery model name?
Most listings tie BLP685 to the OnePlus 6T and OnePlus 7, about 3700 mAh typical at 3.85 V. Check the cell label, since mixed listings sometimes add phones wrongly.
Is BLP685 the OnePlus 6T battery model?
Most listings say so. Lift the back and BLP685 is readable on the cell.
What capacity is BLP685?
Listings give 3700 mAh typical. One listing shows 3610 mAh, probably the rated value, so check the cell label itself.
Can I use BLP685 in a Realme C11 or C15?
No. Some mixed listings may suggest it, but the Realme C-series phones use different, larger packs. Match it against the label of the pack you removed.
Is BLP685 the same as BLP793?
No. They are distinct codes for distinct phones. A shared BLP prefix is no reason to swap them.
How do I know a BLP685 pack is fake?
A fake BLP685 tends to be light, blurred, without batch details and far above 3700 mAh. Compare weight, BLP685 code and plug with the old cell.