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by CZeroOwner
Sun Oct 18, 2020 12:46 am
Forum: General / Main Owners Forum
Topic: It Has Arrived!
Replies: 7
Views: 1881

Re: It Has Arrived!

Our CZero is also a 2012 model with a bit more than 60,000 miles on the clock. The battery capacity is 34.5 Ah. Luckily it's only gone down by 1 Ah over the last year. Apart from batteries with bad cells the lowest capacities I have seen mentioned are about 30 Ah. Have you tried to down load the OBD...
by CZeroOwner
Mon Oct 12, 2020 6:10 am
Forum: General / Main Owners Forum
Topic: It Has Arrived!
Replies: 7
Views: 1881

Re: It Has Arrived!

"Car cap. Ah 36.5" This is the 100% capacity of the battery reported by the car "SoC 68.0" This is the SoC reported by the car "Ah 24.82" This is the present Ah in the battery based on the first two numbers "battery Ah 24.93" This is present Ah in the battery ...
by CZeroOwner
Tue Oct 01, 2019 7:18 am
Forum: Batteries and Battery Management
Topic: Battery Capacity Testing
Replies: 65
Views: 35968

Re: Battery Capacity Testing

It sounds like replacing the cells is a very good idea.

David
by CZeroOwner
Tue Oct 01, 2019 3:14 am
Forum: Batteries and Battery Management
Topic: Battery Capacity Testing
Replies: 65
Views: 35968

Re: Battery Capacity Testing

DRMandrake asked for more details on the voltage differences between the cell in our car. Here 3 graphs showing the cell voltages at difference SoCs. The data for the first graph was collected on June 17 2019 and the second and third graphs are from April 13 2019. Note that the difference between th...
by CZeroOwner
Thu Sep 26, 2019 11:48 pm
Forum: Batteries and Battery Management
Topic: Battery Capacity Testing
Replies: 65
Views: 35968

Re: Battery Capacity Testing

DBMandrake wrote:have you ever checked the spread of capacity of the individual cells?


Yesterday evening, just before charging the car, the SoC was 12.5%. At the same time, the highest cell voltage was 3.730 volts and the lowest was 3.700.

David
by CZeroOwner
Wed Sep 25, 2019 11:17 am
Forum: Batteries and Battery Management
Topic: Is my battery dying ?
Replies: 84
Views: 40585

Re: Is my battery dying ?

My car shows 8% SoC when the voltage is 3,63.

David
by CZeroOwner
Wed Sep 25, 2019 7:20 am
Forum: Batteries and Battery Management
Topic: Is my battery dying ?
Replies: 84
Views: 40585

Re: Is my battery dying ?

My battery was tested in the car. I wasn’t there but the procedure they told me they followed sounded very much like the one you described for the Diagbox. Could it be that the Diagbox knows that 3.63 volts is equal to a SoC of 10% and that the Ah it measures between 3.63 and 4.1 is 90% of the batte...
by CZeroOwner
Wed Sep 25, 2019 7:00 am
Forum: Batteries and Battery Management
Topic: Battery Capacity Testing
Replies: 65
Views: 35968

Re: Battery Capacity Testing

Hi Simon

The guy at the shop said that there was little difference between the cells.

I believe that the degradation I'm seeing is due to the expected degradation of otherwise health cells from cycling and storage time but I'll check on the voltage difference between cells at low SoC.
by CZeroOwner
Wed Sep 25, 2019 4:11 am
Forum: Batteries and Battery Management
Topic: Is my battery dying ?
Replies: 84
Views: 40585

Re: Is my battery dying ?

A couple of weeks ago our CZero was in for service. Part of the service was a measurement of the battery capacity. I’ve written the results up in a post on the battery capacity testing discussion. The shop also told me that their test instrument showed that the expected capacity of a new battery is ...
by CZeroOwner
Wed Sep 25, 2019 3:34 am
Forum: Batteries and Battery Management
Topic: Battery Capacity Testing
Replies: 65
Views: 35968

Re: Battery Capacity Testing

A couple of weeks ago our CZero was in for service. Part of the service was a measurement of the battery capacity. At the same time, I got the previous capacity measurement made 3 years ago. Here they are: https://i.ibb.co/L6Z8KSp/Service-measurements.jpg These values are plotted in the graph below ...

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