Li-on polymer battery BN51

The BN51 is a Li-ion Polymer (Li-Po) rechargeable smartphone battery designed as the original or replacement battery for certain Xiaomi/Redmi handsets

Specifications

• <p><strong>Model:</strong> BN51 (battery part number / model code) &nbsp;</p><p><br></p><p><strong>🔋 Battery Type:</strong> Lithium-ion Polymer (Li-Po) rechargeable cell — combines light weight with good energy density. &nbsp;</p><p><br></p><p><strong>🔋 Capacity:</strong></p><p> • <strong>Rated:</strong> ~5000 mAh (typical)</p><p> • ~19.2 Wh energy capacity (approx.) &nbsp;</p><p><br></p><p><strong>⚡ Nominal Voltage:</strong> <strong>3.85 V</strong> — standard for many smartphone Li-Po batteries. &nbsp;</p><p><br></p><p><strong>🔌 Charging Voltage:</strong> ~4.40 V maximum standard charging voltage. &nbsp;</p><p><br></p><p><strong>📏 Physical:</strong></p><p> • Slim, lightweight design made for internal installation in supported Xiaomi phones.</p><p> • Black casing typical for smartphone batteries. &nbsp;</p><p><br></p><p><strong>🧠 Safety &amp; Certifications (varies by seller):</strong></p><p> • Many replacement BN51 batteries include CE, UL, FCC, RoHS safety certifications for compliance with international standards. &nbsp;</p><p><br></p>