India’s Biggest Mobile
Battery Brand
Battery Brand
Brand: MT Star, Quality Beyond Comparison
Bring back full-day battery life on your Vivo Y21 and Vivo Y21s with the MT Star B-S1 / B-S2: 5000mAh, BIS certified and made to the original size.
The Vivo Y21 and Y21s are among Vivo’s best-selling phones in India. The MT Star B-S1 / B-S2 is a 5000mAh replacement that brings back the long battery life these phones are bought for.
| Battery model | B-S1 / B-S2 |
|---|---|
| Compatible phones | Vivo Y21, Vivo Y21s |
| Capacity | 5000mAh typical / 4910mAh rated |
| Nominal voltage | 3.87V |
| Charge voltage limit | 4.45V |
| Battery type | Rechargeable lithium-ion polymer |
| Certification | BIS IS 16046 (Part 2): 2018 and IEC 62133-2: 2017 (R-41280119) |
| Series | MT Star Premium Series |
MT Star supplies batteries for hundreds of phone models to distributors and repair shops across India. Our Premium Series cells use the original form factor and connector, carry BIS certification, and come with easy returns for any manufacturing defect.
The MT Star B-S1 / B-S2 battery fits the Vivo Y21 and Vivo Y21s. It’s the same battery for all of these models.
This replacement B-S1 / B-S2 battery has a capacity of 5000mAh, matching the Vivo Y21’s original battery.
Yes. It’s certified under BIS IS 16046 (Part 2): 2018 and IEC 62133-2: 2017 (R-41280119) and is made to the original size and connector.
Yes. We recommend having it fitted by a trained mobile repair technician, because modern phones have glued backs and delicate connectors.
Use a good-quality charger suited to your phone. After fitting, charge it fully and use it normally for the first few cycles so the battery indicator calibrates.
Yes. MT Star supplies distributors and repair shops across India. Contact us to become a distributor.
