BL-39KX BATTERY FOR INFINIX HOT 7 / HOT 7 PRO / INFINIX S4 High-quality original replacement battery BL-39KX designed for Infinix smartphones. ✅ Capacity: 4000 mAh | Voltage: 3.85 V | Type: Li-Polymer Provides long-lasting power, safe charging, and reliable performance for your device. Compatible with INFINIX HOT 7, HOT 7 PRO, and INFINIX S4. Perfect replacement to restore full battery life and performance for your Infinix phone. Professional installation is recommended for best results.