hojnikb
Established Member
I think that knowing your SOH is interesting and have been trying ( as a lot have ) to work out its value mathematically from the data we have readily available. My last set of data , and depending on how you compute them in different formats came up with , 91%...95%...97% interesting but about as much use as a chocolate fireguard.
The only time the question becomes important is if ( as Tom says ) if you have a drastic loss of unexplained range within the 7 year period and need to claim for a new battery.
You do your calculations , use an OBD reader find it on or below 70% , take it to a dealer/workshop , they use a different OBD reader or other specialized dealer only equipment , which gives a different figure , you accept/reject that figure and start a complaint. An independent qualified technician is called in , and comes up with a third figure. With MGs reputation , you can see where this is going!
Most present owners will most likely never reach either of those two limits ( 7 years / 70% ) so its going to be a question for 2nd hand owners down the line.....unless of course .... when trading in , the dealer puts on his own ( doctored ) OBD reader and says " Oh ! sorry mate, yer battery is down a lot on its SOH and I am going to have to reduce its value "
As mentioned above; at least for LFP car's the most accurate value seems to be to reset the board computer and check estimated range at 100%. That compared to WLTP range will give you an indication of actual degradation.
NMC cars seem to already report pretty accurate value from the carscanner.
