The B-X8 battery model name, typed as BX8 or b x8, does not appear in any spare part listing, certification record or teardown we could find. vivo does use B-X codes: B-X6 is listed for the vivo S16 at 4500 mAh, B-X9 for the iQOO 11 Pro as a two cell pack, and B-X5 for another two cell phone.
So B-X8 is probably a real code on a recent vivo or iQOO phone that has not yet reached the replacement market, or a misread of a neighbouring code. Either way, the phone itself is the best guide.
Quick facts
What the B-X8 battery model name might be
| Code | Phone in listings | Listed rating |
|---|---|---|
| B-X5 | Two cell vivo phone | 2345 mAh at 7.78 V |
| B-X6 | vivo S16 | 4500 mAh at 3.89 V |
| B-X8 | Not found | Unknown |
| B-X9 | iQOO 11 Pro | 2700 mAh at 7.74 V |
The B-X series covers mid-range and flagship vivo and iQOO phones, many of them sold mainly in China.
Check for a misread label
On worn stickers, X can look like K, and 8 like 6 or 9. A cell that seems to say B-X8 may actually read B-K8, B-X6 or B-X9. Photograph the label in good light and zoom in. Codes on the vivo battery model list may match what you really have.
Start from the phone instead
Open the About phone screen and note the model name and V-number. vivo service centres order batteries by that number, so you do not need the battery code at all to get a genuine replacement. If the phone is an iQOO model, iQOO repairs also go through vivo service in India.
A loose B-X8 without its phone should never go on crocodile clips or a universal charger. Two cell vivo packs run at about 7.7 V and can be dangerous when mishandled. Hand it in at a service centre for recycling.
B-X8 battery model name in searches
People typing "bx8 battery model name" or "b x8 battery model name" usually have a battery or a repair slip in front of them and want to know which phone it came from. If the slip came from a repair shop, ask them which phone model they fitted it to; they will have recorded it. If the battery came with a second hand phone, the phone's model number is a better guide than the code. We will add the phone here once a reliable source names it.
Why some codes have no listings
Replacement sellers only stock a code once enough phones need new batteries, usually a year or two after launch. Codes from China-only models may never be listed in India. That is why a search for a new code can come up empty even when the battery is genuine.
Frequently asked questions
Which phone uses the B-X8 battery?
We could not find any listing that names one. Identify the phone model and ask a vivo service centre.
Is B-X8 a vivo battery code?
It follows vivo's B-X pattern, and neighbouring codes B-X6 and B-X9 are vivo and iQOO packs.
What is the capacity of B-X8?
Unknown. B-X6 is listed at 4500 mAh, but that does not mean B-X8 is the same.
Could my label actually say B-X6 or B-X9?
Possibly. Faded labels are often misread. Check in good light before ordering.
Where can I get a B-X8 battery?
Until sellers list it, a vivo service centre is the only reliable source. They order by phone model, so bring the phone, not just the battery code.
Is BX8 the same code as B-X8?
Yes. The hyphen is just dropped when people type it.