I don't know how many other brands have this, but it doesn't matter if regular EarthX batteries are completely discharged (lights on, parasitic draw, etc.). It just needs to have the BMS reset and then charged normally. They won't actually go dead and be harmed. It removes some worry with an expensive battery. That was a nice feature on my 640 that did have a small parasitic draw. The ETZ model I bought for my 525 doesn't have that feature and is significantly less money. But my entire electrical system is on the relay side of a Trailtech stator. I literally can't leave anything on. The whole electrical system shuts down thirty seconds after the engine is off. I have an accessory plug directly connected to the battery in case I ever need battery power with the engine off. Being a forgetful old(er) man, I try to idiotproof my batteries.