For those who are concerned about the HVB in the Energis, I feel that it is important NOT to use the hybrid battery in the car as much as you might in general. This means that you should switch the car to EV later when you are down to 1-2% charge level and just use the engine without draining the hybrid battery down.
The reason I say this is that I've watched the battery cells and I can see voltage swings between the cells once you start to dig into the hybrid battery. At 1-2% charge level, the cells may be at 0.00v or 0.01v variation at worst, but once you start using the hybrid battery by the time you get to 50% charge level on that you're 0.02 pushing 0.03v variation between cells. Also the VSC number can go up, from 0.24 normally to higher figures.
Basically what is happening is that the 'weaker' cells lose voltage quicker than the rest and they can get more damaged by being drained too much even though the rest of the pack is still in the OK range.
If you have a scangage you can see all this, ideally, you don't want the SOC to drop below 20%. Even with 1-2% battery saved, the system will use more of it and drop you to 20% or sometimes less depending on how you feather the gas to stay on battery.
Another thing that is important is to recharge your battery when you get home due to cooling and voltage drop. For example, last night I got home late and plugged in the HVB to charge it from the hybrid battery back up to some charge in the main battery. It went from 50% charge on the hybrid to 8% charge on the main battery in 46 minutes and then I disconnected the charger to let the battery cool and rest. The charge level was at 8% or 27.2% SOC and the battery temp was 62F. This morning the battery temp had cooled to 48F and the charge level was back down to 0% and the SOC was down to 19.0 SOC! If I didn't charge the battery and left it at 18% soc when I arrived, it could have been at 9% SOC this morning after cooling which would be very bad for the battery.
If you plan to use the car the next day, then you can recharge it before you go to bed or setup a value charge which will charge it up some off rock bottom and continue later when the charge window hits. If you don't plan to use the car the next day then its best to keep the battery SOC level lower, not fully charged, so charge it some at night and then some more in the morning and disconnect it to sit around 20 to 40% charge level max. This helps extend the HVB life by not being 100% all the time sitting fully charged and not being used immediately.
Hope this helps.
Edited by rbort, 25 October 2018 - 07:40 AM.