Infinix / Tecno BL-51Bx Original-Capacity Replacement Battery (5200mAh)

The BL-51Bx (frequently stamped on labels as BL-51BX or BL51BX) is a high-performing internal Lithium-ion Polymer replacement battery manufactured under the Transsion Holdings supply network. It acts as the direct power champion for a highly popular lineup of Infinix’s large-screen media and gaming smartphones. Because these large-display phones undergo heavy screen-on usage and repeated daily charging loops across Bangladesh, the factory battery is highly prone to wear over time.

Typical symptoms of a degraded cell include the phone discharging erratically once it reaches below 30%, sudden power failure during high-volume speaker use or camera operation, or getting stuck in an infinite restart loop on the “Infinix” animation screen. Upgrading to a premium BL-51Bx replacement unit safely restores your phone’s native multi-day standby lifecycle.

• Battery Model: BL-51Bx / BL-51BX / BL51BX

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

• True Capacity: 5200 mAh

• Standard Voltage: 3.85V

• Charging Voltage Limit: 4.4V

• Safety Integration: Formulated with an original-grade dual-IC Protection Circuit Board (PCB). This serves as a safety barrier protecting your mainboard against high-voltage surges, controls operating temperatures during extended use, and stops chemical cell bloating.

• Device Compatibility: This exact 5200mAh structural profile and specialized flex ribbon connector dock match precisely with:

  • Infinix Hot 10 (Model: X682, X682B, X682C)

  • Infinix Hot 11 (Standard Version)

  • Infinix Note 8 (Model: X692)

  • Infinix Note 8i (Model: X683)