Premium Battery for WLTOYS V977 and XK K110 remote-control helicopters. Made from premium materials, it provides a precise fit and reliable power delivery for consistent performance. Easy installation. Quick and straightforward replacement to upgrade your RC helicopter’s power with minimal effort. Improved control and performance. Replacing the old battery accessory significantly enhances steering response and overall functionality during flight. Cost-effective and durable. Compatible, long-lasting battery replacement helps avoid expensive repairs and downtime. Use scenarios: - Before outdoor flights on WLTOYS V977 or XK K110, swap in this battery to restore steady power and responsive control. - As a routine maintenance replacement or pre-session upgrade to maintain optimal performance and handling. - Keep as a spare for travel or training to minimize downtime and stay flight-ready.