Battery BB21 6500mAh by Vivo Y31 5G V2521 Y21d Y21e 2025 Y21 5G V2553 premium quality

The BB21 6500 mAh battery is a replacement for Vivo Y31 5G V2521, Vivo Y21d, Vivo Y21e (2025) and Vivo Y21 5G V2553, in configurations equipped with this battery reference. It features lithium-ion technology, with a rated capacity of 6355 mAh and a nominal voltage of 3.91 V. It is intended to replace deteriorated batteries when the phone experiences reduced battery life, irregular discharge or shutdowns associated with battery wear. Its BB21 identification simplifies component selection for professional repair, maintenance and refurbishment work.

• Component type: Internal rechargeable battery for smartphones.

• Battery reference: BB21.

• Typical capacity: 6500 mAh.

• Rated capacity: 6355 mAh.

• Nominal voltage: 3.91 V.

• Charging voltage limit: 4.50 V.

• Typical energy: Approximately 25.42 Wh.

• Technology: Lithium-ion (Li-ion).

• Compatible models: Vivo Y31 5G (2025), Vivo Y21d, Vivo Y21e (2025) and Vivo Y21 5G, in versions equipped with a 6500 mAh BB21 battery.

• Vivo Y31 5G technical model: V2521.

• Vivo Y21d and Y21e (2025) technical family: PD2510IF, PD2510PF, PD2510QF and PD2510TF.

• Vivo Y21 5G 6500 mAh technical model: V2553.

• Function: Energy storage and power supply for device operation.

The BB21 battery allows the energy storage capacity of compatible Vivo devices to be restored by replacing a deteriorated battery. Its typical capacity of 6500 mAh and rated capacity of 6355 mAh identify the high-capacity configuration used in the corresponding versions. Its nominal voltage of 3.91 V and charging voltage limit of 4.50 V provide specific electrical data for selecting the appropriate replacement.

The BB21 identification helps technical service centres distinguish this battery from other references used in the Vivo Y family. Its application is particularly useful for repairs involving reduced battery life, battery-related shutdowns and refurbishment work. It allows direct replacement of the power supply component while retaining the other functional modules of the device.

• Completely power off the device, disconnect the battery and use electrostatic discharge (ESD) protection.

• Check the BB21 reference, capacity and connector arrangement of the removed battery.

• Carefully disassemble the device and remove the deteriorated battery using appropriate tools.

• Clean adhesive residue from the battery compartment and prepare the surface for installation.

• Position the new battery using suitable mounting adhesives and correctly align the connector without forcing the flex cable.

• Check device startup, battery recognition and charging system operation before final closure.

• Perform a charging test and verify the stability of the battery percentage during use.

• Renew the closure adhesives and check correct assembly and sealing of the device.