Vivo B-S1 Original-Capacity Replacement Battery (5000mAh)

The B-S1 (often stylized as BS1) is a high-density internal Lithium-ion Polymer replacement battery engineered by Vivo for its modern mainstream Y-series smartphones. Swapping your old battery for a fresh B-S1 is the primary remedy for typical aging symptoms, such as the phone shutting down unexpectedly at 15–20%, draining rapidly during intensive app use, or overheating during charge cycles.

• Battery Model: B-S1

• Battery Type: Lithium-ion Polymer (Li-Po)

• True Capacity: 5000 mAh (Typical) / 4910 mAh (Rated)

• Standard Voltage: 3.87V

• Charging Voltage Limit: 4.45V

• Safety Integration: Fitted with a premium Protection Circuit Module (PCM) and upgraded dual-IC safety control chips to actively absorb power spikes, manage overnight overcharging, and prevent cell expansion (swelling).

• Device Compatibility: This 5000mAh battery structure fits perfectly in:

  • Vivo Y21 (2021 / Model V2111)

  • Vivo Y21s

  • Vivo Y33s

  • Vivo Y31s 5G