I ran on dead 0 for about 5km on Tuesday. When I checked the app it said 0%. No idea how long I could have gone for.
I had done it before in the RAV so I assumed there was some margin. It was the day I drove the Smart home from the dealer and my wife was following me in the other car. I also had a portable GPS so I knew the miles to home. I just don't have a clear recollection but I remember being frustrated because the remaining miles went off the screen at 10 miles to go and the display read "charge immediately" or something like that. I didn't know enough about the display to get the remaining miles back on the display.So, as a data point, you pushed it to 0 range left and then some more, and the safety feature never kicked in. How far past the 0 point did you go?
I must say that you are pretty gutsy to do have done that, unless you were just driving in a near circle close to home!
I would not put a lot of emphasis on what Smart customer service says about LiIon batteries unless they demonstrate some real knowledge of the chemistry. EDIT Their answer sounds like they are placating you.I posed a question to the MB customer portal a couple of weeks ago regarding whether they would recommend not fully charging if a full charge is not required to meet your daily driving needs (i.e. if you only need to use about 50% of the SOC as an example, would it be better to stop charging at 80% and operate on a daily basis between 30-80% SOC, or if it would be better to fully charge and operate between 50-100% SOC).
They responded that it doesn't hurt to not fully charge, but they would recommend fully charging so that the maximum range is available for use..... Would seem to indicate more concern about deep discharging than there is about over charging. I assume this would be because the BMS can more easily control what happens at the top of the charge than it can control what happens at the bottom of the pack, when a driver, for whatever reason, ends up at the bottom of the pack.
Whereas, we drivers might ignore the warnings and flashing alerts that occur, starting at 20% SOC, it much easier for the BMS to simple stop charging when the pack is charge to the safe level that it is programmed for, be it 80%, 95%, 98% or whatever is safe enough from their perspective to prevent dangerous fires and deliver the cycle lifetime that makes the lease not break the bank from their perspective.
I've followed up with a question regarding whether we should occasionally do a deep discharge into the 5-10% or lower range so that the BMS can keep it's set points calibrated in order to give reasonable predictions of range and SOC%. Will advise if and how they respond.
I've got the update. Never tried if it fixes 1.b, but nether found anything else that changed after that.2. There is a 2016 service campaign No. 2016060002 which is a software update to the BMS. Is this update a fix to the above problem, or was it something else? Is it possible to find cases of the above problem occurring to cars that have had this update done?