BMW i3 range?

anticat900 · 2024-12-02T12:56:26-0600

I have just bought a BMW i3s rex, with 148,000 on it and the battery is at 72%.
I can get on 100% charge about 120miles in eco pro mode.
Can people advise what they get on 33kw rex and 42kw non rex, when the battery is less well used?
I'm sure my car is likely using all of its reserve capacity by now.
Thanks
David

EvanstonI3 · 2024-12-02T13:25:47-0600

You might want to mention what year your car is. There are 3 different battery packs.
Where do you get the "72%" from?

anticat900 · 2024-12-02T13:26:48-0600

Hello, Mine being a i3s rex is a 33kw

anticat900 · 2024-12-02T13:27:50-0600

There is a battery health check built into the driver display, a series of button combinations will give you the health of your i3 battery.

EvanstonI3 · 2024-12-02T13:36:00-0600

anticat900 said:
There is a battery health check built into the driver display, a series of button combinations will give you the health of your i3 battery.

Then what is the BATT.KAPPA.MAX number that you see?

alohart · 2024-12-02T15:36:33-0600

anticat900 said:
Can people advise what they get on 33kw rex and 42kw non rex, when the battery is less well used?

I'll be that bothersome guy and point out that "kW" is power while "kWh" is energy (capacity). The 33 kWh and 42 kWh battery packs both have the same maximum power output, 125 kW for the i3 and 135 kW for the i3S.

anticat900 said:
I'm sure my car is likely using all of its reserve capacity by now.

I haven't read that the BMS reduces the sizes of the low and high charge level buffers as the battery cells lose capacity. I have seen the BMS data displayed by the mi3 app on a battery pack that was about to be replaced under the excessive capacity loss warranty. It low charge level buffer remained the same ~10% as when it was new. The high charge level buffer was displayed as much larger than when new which I think is how the BMS displays capacity loss. The capacity to % charge level ratio remains constant, so when the capacity decreases, the highest attainable charge level, which must be relative to when the battery pack was new, decreases. However, the battery pack voltage at a full charge was similar to when it was new indicating that the high charge level buffer hasn't changed much.

If you calculated the 72% capacity compared with new by using the Batt. Kapa. max value, this is only a calculated estimate that can vary considerably over time. 120 miles on a full charge might be excellent for a 94 Ah battery pack, even in Eco Pro mode, depending on the driving conditions and assuming that you're not including the REx range. This exceeds the E.P.A. rated range when new and probably wouldn't be likely were the capacity of your battery pack only 72% of the new capacity.