The Grandstream WP826/WP836 Spare Li-Ion Battery is an official replacement battery created specifically for the WP826 and WP836 rugged cordless Wi-Fi IP phones. Featuring a 3000mAh capacity and 3.7V Li-Ion technology, it delivers dependable long-lasting power for business communication environments. The battery is designed to maintain optimal performance, offering extended talk time and standby duration for mobile VoIP users. Its compact and lightweight design allows easy replacement and quick installation when needed. Built with high-quality lithium-ion cells, it ensures stable power delivery and safe operation for daily professional use. This spare battery is ideal for offices, warehouses, hospitality, retail, and industrial environments where uninterrupted communication is essential. Using an original compatible battery helps maintain the performance and reliability of Grandstream cordless IP phones.