vivo X300 Ultra BB57 Battery: 6600mAh Specs, Teardown and Battery Life

The vivo X300 Ultra BB57 battery can be identified directly in WekiHome’s teardown video. Its label lists 6600mAh typical capacity, 6395mAh rated capacity and 3.74V nominal voltage. For repair shops, wholesalers and purchasing teams, that label is a practical starting point for comparing a proposed replacement assembly.

Figure1. Removed BB57 battery, label side, at14:00. Both connection tails are visible; the rear surface is not shown. Source: WekiHome. Original 3840 × 2160 frame; click to inspect.

BB57 battery specifications: capacity, voltage and energy

Specification	Value	Evidence
Battery model	BB57	Teardown label
Battery chemistry description	Rechargeable Li-ion battery	Teardown label
Typical capacity	6600mAh	Label and vivo
Rated capacity	6395mAh	Label and vivo
Nominal voltage	3.74V	Label and vivo
Typical energy	24.69Wh	Label and vivo
Rated energy	23.92Wh	Label and vivo
Limited charge voltage	4.525V	Teardown label
Cell design	Single cell	vivo official product notes

vivo’s official product notes confirm the single-cell design and capacity figures. The two capacity values describe different rating conventions for the same battery. They are not separate cells to add together. Two visible connection tails do not turn this into a dual-cell pack.

As an arithmetic cross-check, 6.395Ah × 3.74V gives approximately 23.92Wh. Likewise, 6.6Ah × 3.74V gives approximately 24.69Wh. These calculations agree with the listed energy values. The 4.525V charging limit is a battery specification; it is not the phone’s USB input voltage.

What the real teardown images show

Figure2. BB57 battery still seated in the partly stripped phone at13:40. The label and nearby components are visible. Source: WekiHome. Original 3840 × 2160 frame; click to inspect.

The installed view helps a buyer compare the battery’s position within the frame and beside surrounding parts. It provides useful assembly context, but a photograph cannot establish exact dimensions, connector pin assignments or interchangeability with another vivo handset.

Figure3. Battery removal in progress at13:56. This shows the label side and is not a rear-battery photograph. Source: WekiHome. Original 3840 × 2160 frame; click to inspect.

Use the original label image to identify BB57 and the electrical ratings. Use the other views to compare physical details with the part offered by a supplier. A matching capacity alone is insufficient: request measurements and close-up photographs of the connector and flex routing before approving a sample.

vivo X300 Ultra battery life: measured results and conditions

Notebookcheck’s X300 Ultra review reports 22 hours 59 minutes in its Wi-Fi web-browsing test using Chrome 147, with display brightness adjusted to 150cd/m². The reviewed import unit had 16GB RAM and 512GB storage. This measures a complete phone under that test, not a standalone battery or an untested replacement pack.

Battery age, software, brightness, mobile-network conditions and workload can change a customer’s result. Repair businesses should avoid translating a laboratory browsing figure into a guaranteed number of days after replacement.

vivo lists 100W wired and 40W wireless charging for the handset, subject to its charger and operating conditions. Those system capabilities do not establish charging performance for a replacement battery whose control electronics and assembly have not been checked.

What to include in a BB57 replacement battery inquiry

For a vivo X300 Ultra replacement battery request, provide the exact handset variant and destination market, a photograph of the original BB57 label, the connector arrangement, required quantity and any sample requirements. Ask the supplier to identify its offered part’s rated capacity, nominal voltage, dimensions and assembly revision.

For wholesale purchasing, agree on the sample evaluation and capacity-test conditions before comparing quotations. Request documents applicable to the specific offered product and shipment. Marks visible on the teardown battery do not verify the documentation or certification of a different supplier’s product.

Sources

• WekiHome: vivo X300 Ultra teardown — battery label and original video frames.
• vivo X300 Ultra official product page — capacity, energy, single-cell design and handset charging specifications.
• Notebookcheck: vivo X300 Ultra review — independent browsing endurance and test conditions.