2014 Renault Zoe - Q210 How to find battery SOH?

Nat2000 · Mar 14, 2022

Hi All, This is dynamique intens 2014 model with leased original traction battery. 8 years, so range has dropped significantly.
My question - Is this a good way of finding the battery SOH (state of health)?

I trickle charge the battery to 100%

Then I reset the onboard range computer (using break accelerator reset trick)

Then I see the new range is around 90 miles

I believe the very original ideal range stated by renault for this model is 130 miles

Then I divide 90/130. This gives me 69%

Does this mean my battery SOH is 69%?

I believe if this procedure was performed when this zoe was manufactured it would be 130/130 = 100% SOH
Is my understanding correct? Or is there more to it? I know renault will not calculate it this way, but should this method give a good indication of the battery SOH?
Any help will be appreciated.
Thanks in advance
Nat

ThudnBlundr · Mar 14, 2022

Way back when, that was the cheap 'n' cheerful way to check the range, as the 2-pedal reset removes all the driving data and resets it to the factory default. Of course you can buy an ODB2 reader and use the free CANZE app to read the SOH directly from the car itself. That will also tell you what versions of the BMS your car is running. It might be that flashing the latest BMS will magically release some extra SOH. That certainly happened 4 years ago when ours was surprisingly low - it went up from 81% to 97%. Now some 4 years and 40k miles later, it's back down around 80%

Sandy · Mar 15, 2022

Try my little formula. Proven to be pretty accurate.

range available after full charge

Have just got 2015 Zoe 22kW. When battery is 100% charged, stated range is only 59 miles! I may be misunderstanding things, but had thought the range displayed would be 120 miles or cose to the theoretical maxium, and that as I started driving the displayed range would fall to the "real-world"...

www.speakev.com

2014 Renault Zoe - Q210 How to find battery SOH?

range available after full charge

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