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Low cost / Automatic Emergency Light - Electronics-Lab.com
Description Here is a white-LED-based emergency light that offers the following advantages: It is highly bright due to the use of white LEDs. The light turns on automatically when mains supply fails, and turns off when mains power resumes. It has its own battery charger. When the battery is fully charged, charging stops automatically. TheRead More
Universal-battery-charger : Battery Charger Circuits
Universal-battery-charger - schematic
Lithium-Ion Battery
Lithium-Ion Battery. Inside the power source for portable electronics and electric vehicles