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.

BB57 battery specifications: capacity, voltage and energy

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

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.

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.