About elxjar: elxjar focuses on developing reliable power solutions for portable lighting and electronic equipment. All products are engineered as third-party compatible accessories designed to meet functional and dimensional requirements without claiming brand authorization or affiliation. Product Overview: This 3.7V 1100mAh lithium-ion rechargeable battery is designed to be compatible with devices that use the E99ACA battery form factor. It features a modern USB-C charging interface and stable voltage output, providing consistent performance for hybrid USB rechargeable headlamps and similar lighting equipment. Usage Scenarios: This battery is suitable for outdoor lighting systems used in activities such as hiking, camping, night operations, inspection work, and emergency preparedness. It is intended for headlamps and lighting devices designed to accept E99ACA-style rechargeable battery packs without modification. Key Features: The battery operates at 3.7 volts with a rated capacity of 1100mAh, delivering approximately 4.07Wh of energy. Lithium-ion chemistry provides stable discharge characteristics and efficient energy density. The integrated USB-C port allows direct charging from common USB power sources such as wall adapters, power banks, and laptops. For best performance, a full charge is recommended before first use. Compatible Models: Compatible with devices designed for E99ACA battery format and hybrid USB rechargeable headlamp systems that match the same voltage, dimensions, and contact layout. Compatibility is based on battery structure and electrical specifications rather than brand authorization. FAQ: Q1: Is this battery rechargeable? A1: Yes. This is a rechargeable lithium-ion battery with an integrated USB-C charging port. Q2: How should the battery be charged? A2: Charge using the included USB-C cable connected to a standard 5V USB power source. Q3: Should the battery be charged before first use? A3: Yes. A full initial charge is recommended to activate the battery chemistry and ensure optimal capacity. Q4: Is this an original manufacturer battery? A4: No. This is a third-party compatible battery produced by elxjar and is not an official or authorized product of any device brand. Q5: What devices can use this battery? A5: Devices that are designed for E99ACA battery specifications and hybrid USB rechargeable headlamp designs, provided voltage and dimensions match.