Solar lamp controller module designed for small solar lighting systems using a 3.7V lithium battery. Compact replacement part that delivers automatic night illumination, three selectable brightness levels, and built in overcharge protection to simplify upgrades and repairs. Key benefits Reliable battery management: Protects a 3.7V lithium battery from overcharge to help maintain stable performance and reduce battery stress. Automatic night activation: Lights turn on automatically at dusk and off at dawn without manual intervention. Adjustable brightness: Threelevel switch lets you choose higher output for brighter illumination or lower output to extend run time. Easy replacement and compact fit: Small form factor fits most small solar lamp housings for quick module swaps or repairs. Simplifies repairs: Replaces faulty controllers to restore proper charging and lighting functions without replacing the entire fixture. Main features Designed for 3.7V lithium batteries and compatible with many small solar garden lights and portable solar lamps. 3level manual switch for selecting light output and power conservation settings. Overcharge protection circuit to prevent excessive charge cycles and support predictable operation. Automatic dusk to dawn operation for hands lighting control. Compact electronic module suitable for infield replacement of worn or damaged controllers. Use scenarios Pathway and garden lights: a failed controller to restore automatic night lighting and selectable brightness for walkways and borders. Post and deck lamps: Upgrade the controller in small postmounted solar fixtures to regain reliable charging and dusk activation. Portable solar lamps and DIY projects: Integrate the module into small custom solar lamps that use a single 3.7V lithium cell. What it solves Eliminates flickering or nonfunctional lights caused by a worn controller. Restores automatic on off control and proper charging behavior. Provides a simple way to reduce brightness for longer night runtime without altering the battery. Compatibility and installation notes Intended as a replacement controller for solar lights that use a single 3.7V lithium battery and a small internal controller board. Confirm voltage and connector compatibility before installation. Installation typically involves disconnecting the old module and connecting the replacement module in the same wiring locations.