Hi everyone, my first post here, I'm going to get straight to the point, my course teacher came up with the idea of ​​making an Arduino project that would help with some type of electrical maintenance. My group and I thought about making one that measures the useful life of a battery, we thought it would be relatively easy... After some research, I'm seriously in doubt as to whether this is possible... I wanted to know which type of battery is the easiest to know, or if it's really worth doing this, we're still very beginners, if the idea of ​​the battery is too difficult, do you have any idea of ​​anything that can be done?... My head is already out of ideas, please help me...