Hey All - I have had the pleasure of having the BMS Update a couple of weeks ago from Renault, and wanted to wait a bit to report on it. Not exactly an exciting topic, but if you got a Zoe, it is worth noting this free and important update to your battery.
What it solved: Charging between 99% and 100% can take up to 2 hours, and the milage at 100% charge shows to be about 68miles of range - doubting that the SOH of the battery being low. Essentially, it fakes you out that your SOH is about 75% with low ranges, to which you would have to charge prematurely since you would not chance in running out of juice. This amplifies range anxiety, and on long trips increases the number of stops you have to make for a recharge. This could also have impacted a claim on RCI for a new battery. Their BMS algorithm is deliberately programmed so as to avoid RCI claims on battery replacement, and running out of charge while on the road. What I mean by this, is that their programming was aimed to change human behaviour to give more margin of error in charge left so you don’t incur a breakdown, all the while trying to show that your SOH is above the 75% mark. It’s a difficult balance, but they really have 26KW as capacity of which they calibrate in using 22KW, so already they have some margins built in. My goal is to get a realistic range, from the Eco scoring/Temp considerations, so I can plan trips and charge schedules better.
Renault Experience: They gave me a loaner car as it was expected to take 1.5days, it actually took 3 days over a weekend as well. The delay was due to the Zoe refusing to take the update, and was later on determined that the battery must be partially drained before the update can be done, as safety/recalibrations take place. Additionally, they must test the 100% charge, range, and operation of the vehicle before handing it back. It also clears your ECO driving history so consider saving it before getting this done.
Outcome: Out of the dealership, the range at 100% was 88 Miles, now with a 93% Eco score, I can get up to 97 Miles on the range when fully charged. The SOH was measured at 98% (had the screenshot of their diagnostic tool, since I was a skeptical customer). The battery charge distribution across the whole battery was very even - meaning my battery was in great shape considering it is the original one from 2014.
Overall - it is definitely worth getting it done. The difficulty is the dealer - their education on this issue is low, it took 3 visits to impose for them to get it done properly and getting my SOH back correctly (they lied once about it being 100%). However, after going on about it - they bit the bullet to get it done, and now the range is reflecting a more realistic projection - allowing you to plan your trips better. I am currently mapping the recharge conditions, range, temp, Eco score to see if the “Actual Milage” reflects the “Milage used from the range meter” - since if that is overly optimistic, that could create an issues also. I will share any conclusions from that with you all once the study is completed. I hope this helped anyone with a Zoe looking into this particular issue.