Review on Runleader 36V LED Battery Capacity Indicator, Battery Charge & Discharge Meter, Ideal for Lead Acid Battery (excluding Trojan), Compatible with Golf Cart Electric Vehicle, Star Car, Stacking Machine, Alternator by Robert Lewis

I've read some bad reviews about it not working, it works great for me and is fairly accurate. They have some super nerds who want it to be extremely accurate, to the point where they make up formulas and equations and crap to prove it's not 100% accurate. It's not a Tesla, I just need it to tell me when it's low (beer math). For those who don't know how to install it properly, here is an easy fix. Connect + and - directly to the batteries (mine is 48V), connect the C terminal to one of the wires in the ignition (the one that gives you 12V when you turn the ignition on). Use a voltmeter, I just rolled the dice and ended up hooking it up to the wrong wire, so I just hooked it up to a different one (there were only two wires, I had a 50/50 chance).