powersurge wrote:I have always heard that the batteries like to be at 50 % charge. I have also always thought that draining down to 20% before charging results in a greater strain than recharging at 40-50%????
I don't think this is accurate. I don't know if this is true now, but with older Li batteries, if they weren't fully discharged, the would lose their zero point. Something to do with migration of free radicals and dendrite formation... not sure I understand it all, but I believe migration happens more under full charge , not when empty.
It is very likely true. The battery's best charge capacity is dependent upon having as near a perfect balance of the two compounds that represent the anode and cathode. As the compounds swap back and forth, the ability to regenerate back to a balanced level is reduced. Now this is a VERY simplified answer but the ideology remains the same.
Obviously leaving SOC near 50% all the time is not beneficial to range unless you have a LOT of charging opportunities and very short drives. So the question becomes is it better to go deeper into discharge or recharge?
Well, since we want the battery to be recharged, I have to say the higher the SOC the better as long as
You drive it daily, One way commute reduces SOC to 80% or less.
Another thing to keep in mind; I charge fully nearly every day due to the amount of driving I have to do and experience little as far as abnormal degradation. Now we can talk about the weather but if ONLY comparing cars IN MY LOCAL AREA, the facts remain the same.
Point 2; You car makes a big deal of letting you know that you should charge when SOC is low. Do not ignore your battery warnings.
ALWAYS PLUG IN IMMEDIATELY TO GAIN ENOUGH CHARGE TO TURN OFF THOSE WARNINGS ASAP.
Does this mean stopping 10 miles from your house to plug in when LBW comes on? Well, since I don't do that, I am not going to recommend that anyone else do that either but I do plug in for an hour or two when I get home no matter what time of day it is...