The B-D9 battery model name, often typed as BD9, belongs to the vivo V9 family: listings name the V9, V9 Youth, Y85 and Z1, all built on the same design. The stock capacity is 3260 mAh, the figure vivo gave for these phones.
The V9 was a popular selfie phone in India, and many units are still in use with ageing batteries. A replacement B-D9 is one of the most common vivo battery jobs at repair counters.
Quick facts
Phones that use the B-D9 battery model name
| Phone | Notes |
|---|---|
| vivo V9 | Main model, 6.3 inch notch screen |
| vivo V9 Youth | Same body, lower specs |
| vivo Y85 | Close relative |
| vivo Z1 | China model on the same design |
3260 or 3150 mAh
vivo's spec sheets give 3260 mAh. One replacement maker lists its B-D9 at 3150 mAh, which is plausible as a rated minimum or a slightly smaller aftermarket cell. Either should fit. Avoid packs that claim 4000 mAh or more: the V9 body has no room for that, and the claim is false.
B-D9 and other vivo B codes
vivo's two character codes are easy to mix up. B-D9 is the V9; B-F3 is listed for the Y93 family, B-H9 for the Y19, and B-O5 for the Y20 range. Each one fits only its own phones. The vivo code index lists them all.
Replacing a V9 battery
Opening a V9 means easing off a glued plastic shell that carries the fingerprint reader, whose ribbon tears easily. A vivo service centre or an experienced repairer will do it in under an hour. Confirm the V9, Y85 or V9 Youth name under About phone, request B-D9 by its code, and look for a batch line on the new sticker.
Most V9 phones are now several years old. If the back has lifted near the camera or the screen pushes out, the B-D9 inside is swelling. Stop charging, keep it on a hard surface and get the cell removed.
B-D9 battery model name on the sticker
A vivo-made B-D9 shows its code at the top, then nominal and limit voltages, the 3260 mAh typical capacity and a slightly lower rated one. A QR code or a vivo logo is common. Aftermarket packs may lack the logo; that is acceptable if the code and voltages are printed clearly. Packs with only a phone name and a big number are best avoided.
What a new B-D9 gives you
A fresh 3260 mAh pack returns the V9 to roughly a day of light use. These phones charge at 10 W through micro USB, so a full charge takes about two hours. If the phone still drains fast after a battery change, an old app or a constant sync is often to blame; see our fast drain checklist.
Is the V9 worth repairing
For calls, chat and photos, yes: a battery is far cheaper than a new phone. If you need current apps that run slowly on older chips, a newer vivo with a 5000 mAh pack will last almost twice as long per charge.
Charging the V9 family and recycling the old cell
The V9, V9 Youth and Y85 use micro USB at around 10 W. Ports on phones this old often wear loose. A V9 that charges only with the plug pressed at an angle needs a new port, not a new B-D9.
Hand the old cell back to the service centre or repair shop that fits the new one. Do not throw a lithium pack in household waste or keep a swollen one in a drawer. Shops and service centres send old cells for recycling, and many refuse to return a damaged pack for safety reasons, which is correct.
Frequently asked questions
Which phone uses the B-D9 battery?
The vivo V9, V9 Youth, Y85 and Z1, according to listings.
What is the vivo B-D9 battery capacity?
3260 mAh stock; some replacements print 3150 mAh.
Is BD9 the same as B-D9?
Yes. The hyphen is usually dropped in searches.
Can B-F3 replace B-D9?
No. B-F3 belongs to the Y93 family and has a different size.