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Published on Oct 4, 2015
This simple DIY Li Ion Battery LED Level Indicator can be used for DIY Li-Ion based Power Bank, or can Test Li-Ion Battery level on battery 18650, Li-ion Battery Smartphone, Battery Li-Ion 26650, etc. you can use this simple kit for several project, ie: simple battery indicator for DIY Power Bank, simple battery indicator for DIY Solar Cell Power Bank, Test the Li-Ion battery level condition, etc. the circuit consist only few components, can detect Li-Ion battery level conditions in Low, Medium, High, and Full level. if battery drop in medium level, red LED become lights up and more brighter if battery in low level condition (arround 3.6 Volt). with my test, the green LED is always on but more bright in high level.
because the design is simple, so it will only show 2 LEDs only. if you want a level indicator for Li-Ion battery with more LEDs, then I suggest to buy the "powerbank case DIY module" (its cheap and have built-in Li-Ion battery level indicator), check on the following link: with 4 LED's: goo.gl/SNbkgB with digital percentage: goo.gl/rF5CnA