The ExpertPower 3.7V 700mAh Li-ion Battery is the ideal replacement for Yaesu / Vertex FNB-52Li battery, offering reliable performance and lightweight convenience. Designed specifically for the VX-1R, this Li-ion battery provides dependable power in a compact format, making it perfect for daily use, amateur radio, or professional communication. Compatible with OEM chargers, this battery is a smart and safe upgrade for users who need compact power with no compromise.