[WalterM6]

To make it easier to remember you need to round them numbers off. No need for all that accuracy. At approx 51 your at 100%. For each half volt drop you are down 10%. So when you are at 47.5v you need to head to the charger because you're at 50% charge. Don't take/trust any reading until your voltage has settled for at least one minute after you have taken your foot off the throttle.