The Ozonics Long Life Rechargeable Battery will last approximately 8 hours in treestand (boost) mode, and 10 hours in blind (standard) mode. Smart battery technology relays information to the HR300 to maximize run time based on usage conditions and promotes increased battery life. The Ozonics HR-300 extended life battery takes approximately 6 hours to charge and is for use with Ozonics HR300 only. The Smart Rechargeable Lithium Ion battery should be recharged in the Ozonics Smart Charger (not included) only to optimize charge time and battery life. Battery is shipped in a partially charged state. Before first use, fully charge it using the Ozonics Smart charger a minimum of 6 hours for optimal battery performance.