Hailong battery plug in voltage reader

thingiverse

When charging E-bike batteries, it's crucial to only charge them up to 80% for everyday use and store them at 60% for maximum lifespan of the cells. Accurate checking of the voltage is a must. You can definitely use a multi-meter and manually check them occasionally, but I needed a way to quickly charge and monitor multiple batteries from a distance, so I created a plug-in battery meter specifically designed for my Hailong style batteries. To build this meter, you'll also need the following parts: A male battery connector, like this one: https://www.aliexpress.com/item/32973417333.html A panel-style voltage meter, such as this one: https://www.aliexpress.com/item/33023255446.html Four M3x20mm hex bolts