A reliable replacement battery for MSI laptops using BTY-M66 and CR420, delivering stable 10.8V–11.1V power, strong backup time, and dependable everyday performance. Built with high-quality Li-ion cells for perfect compatibility and safe usage. The BTY-M66 / CR420 MSI battery is a high-quality Li-ion replacement designed for MSI CR-Series, CX-Series, and select A-Series laptops. Offering 10.8V–11.1V output with a capacity of 4400mAh to 5200mAh (48Wh–56Wh) depending on version, this battery restores excellent backup time, efficient power delivery, and smooth laptop performance. Built with durable A-grade lithium cells and advanced safety circuitry, it provides protection against overcharging, overheating, and short-circuiting—ensuring long battery life and reliable daily use.

• Long-lasting battery backup with stable and consistent performance.
• Smart protection against overheating, overcharging, and electrical faults.
• Premium Li-ion cells deliver durability and extended lifespan.
• Perfect physical fit for MSI CR-Series laptops easy installation.

Compatible Laptop Models:

• MSI CR420
• MSI CR400 / CR410 / CR430
• MSI CX420 / CX430
• MSI A-Series models using BTY-M66