3.7 volt battery charger with low & full level indicator - YouTube
Li-Ion Battery Charger Circuit
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batteries - Can I keep Li-Ion battery 'charging' continuously at 3.7 V? - Electrical Engineering Stack Exchange
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how to make USB 3.7V Li-Ion Battery Charger Circuit | battery charging cut off circuit | USB 3.7V Li-Ion Battery Charger Circuit | In this article we study a simple computer USB
Auto cut off 3.7 volt Battery charger circuit using Relay, Simple 3.7 volt Battery charger - YouTube