ed5000 wrote: I'm wondering if I should park the car until the Monday appointment.
zzcoopej wrote:How recently have you driven to <2 bars and then done a full charge, and after that left the car on for a while after 16 bars was reached (which triggers cell balancing)? It is also possible if you are using an off-peak dedicated circuit that is on for only 6 or 8 hours that the final balancing stage is not getting a chance to run to completion.
PV1 wrote:Failing to charge to 16 bars has always been the telltale sign of a faulty cell. Capacity degradation, on the other hand, will only show by a decrease in RR but will still charge to 16 bars. The more the faulty cell discharges, the less and less the battery will charge. You are correct that the car will adjust the pack's SoC based on the faulty cell's voltage, so no cell will be driven outside of its specified voltage range. However much charge the pack can take before a cell reaches 4.11 volts is all the more charge the car will put into the pack.
I would continue to drive the car as long as possible, as even when it sits, the bad cell continues to discharge, which has left at least one member with a bricked car. Eventually, if the cell continues to lose charge, you'll get to a point where the MCU warning light will start coming on. But, if your appointment is Monday, you should be able to continue using the car for the rest of this week (but Friday's commute will be pretty close ). Keep your cord with you.
Using CaniOn, it might be a good idea to track the charged %SoC. My hunch is that the percentage of a "full" charge will continue to decrease (my car got to the point where I only had about 10-15 miles of charge available), however one member managed to bring their pack back into balance with repeated driving and charging.
kiev wrote:How much hassle would you suffer if the cell runs out on the way to work or on the way home?
It seems that you were lucky that it failed gracefully and didn't (yet) leave you stranded, and maybe not press your luck too far--unless you feel really lucky, then go for it and share the adventure...
ed5000 wrote:That is a good point. I have been using the car's delay timer which is set for 5 hours of charging. That seems fine for charging up a half full battery but it may need more time now.
zzcoopej wrote:Remember it is only after you drop to <2bars (ie flashing) that the BMU will trigger cell balancing when the battery is subsequently fully charged. If what you say has been going on for many months, cell balancing may not have happened to your battery in a LONG time and could easily explain a cell drifting well out of balance.
ed5000 wrote: My car actually did go to 2 bars flashing today for the first time in some time.
How long would you say (in Time and Km) since you did a full charge from <2 bars, including enough time to balance considering I doubt 5 hours is enough)? Are we talking months or years, and 10,000km or more?
ed5000 wrote:The last week of January I took a road trip and got it down to one bar.