Threepiece solar lamp controller module kit for 3.7V lithium battery systems. Each set includes a control circuit board with switch and a solar power charging module designed for small solar panels and LED lamp applications. Key benefits Ready to use: Three complete controller modules let you or build multiple solar lamps without sourcing separate parts. Simple control: Each board includes an integrated switch for easy on and off operation and straightforward wiring for LED loads and a 3.7V lithium battery. Reliable charging and management: Modules provide charging and load control designed for singlecell 3.7V lithium batteries, simplifying battery connection and solar panel integration. Compact and lightweight: Circuit boards are compact PCBs with standard electronic components for easy mounting in small lamp housings and DIY enclosures. Time and cost efficient: a faulty controller or assemble solar lights quickly using readymade modules. Functions and compatibility Solar charge control for small photovoltaic panels and singlecell 3.7V lithium batteries. Load switching and lamp control suitable for LED lamps and lowvoltage lighting loads. Compatible with common DIY solar lamp designs and projects that use 3.7V lithium battery chemistry and lowpower LED arrays. Standard PCB terminals for battery, panel, and load connections allow straightforward integration without specialized wiring. What is included Three controller modules, each consisting of a control circuit board with switch and a solar charging circuit configured for 3.7V lithium batteries. Typical applications Garden and pathway solar lamps: a worn controller module to restore automatic charging and night lighting for outdoor LED fixtures. DIY solar lighting projects: Build small solarpowered lamps or lanterns using the modules for charge management and on off control. Remote sensor or indicator power: Provide simple solar charging and load control for lowpower outdoor electronics that run from a single 3.7V lithium cell. Why choose these modules Designed for straightforward and assembly of small solar lighting systems. Preconfigured for singlecell 3.7V lithium batteries to reduce setup complexity. Compact form factor and included switch make installation and testing practical for hobbyists and smallscale installers. Basic installation tips Verify battery polarity and use a singlecell 3.7V lithium battery rated for your lamp load. Connect the solar panel to the panel terminals, battery to the battery terminals, and LED load to the load terminals. Mount the PCB securely inside the lamp housing away from direct water exposure and ensure the switch is accessible for manual control. This kit provides three readymade solar lamp controller modules for straightforward charging and lamp control in small 3.7V lithium battery systems, suitable for repairs, DIY projects, and small outdoor lighting installations.