LED Bottle
thingiverse
Today I made this neat christmas present. You'll need the following parts: - An empty bottle - LED chain light - Resistor - TP4056 - 1s LiPo (180mAh in my case) - micro switch - Bottle cap I designed for a small 35cl bottle (note that it might be too small for your bottle, it has a diameter of 16mm) Solder the resistor to the switch and connect the outputs of the TP4056 to the battery, minus of the LED to the minus output and the positive output to the switch in order to interrupt the circle. Stick the parts into the 3d printed cap and push it into the bottle. Done! Original project source: http://www.doityourselfgadgets.com/2018/09/rechargable-led-bottle-light.html
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