3.7V lithium battery solar charger control module with a switch. Product features: Solar lamp control panel, dedicated to 3.7V lithium battery Equipped with overcharge and overdischarge protection and three-level switch (light off, full power, low power) The lam is charged during the day and can be illuminated at night, automatic control without human intervention Technical data: Working voltage: 3.7V lithium battery Charging current: <1A Overcharge protection: 4.25V Over discharge protection: 2.8V Light board: 3.0-3.2V lamp beads in parallel Output power: <1W For solar panel: 6V 3 light levels (light off, full power, low power) Dimensions: Approx. 36 x 23mm / 1.4 x 0.9in Mounting hole pitch: approx. 25mm / 1in https://elecena.pl/product/22626345/3-7v-lithium-battery-solar-charger-control-board-with-switch 2023-02-23 https://elecena.pl/product/22626345/3-7v-lithium-battery-solar-charger-control-board-with-switch 2025-10-28