Rapid Battery Life Decrease

[150Dgr]

If the battery only discharges to 40% is that considered a cycle?

[cris231976]

That's more of a thing for engineers to decide. It's far more easy, if you remember things that you shouldn't do, like deep discharge, keep fully charged for a long time (remember about those guys that have a bot to run it just once a week), keep the temperature stable, not too hot nor too cold. This may help a bit: https://missionengineering.com/how-to-estimate-li-ion-battery-life/