Battery options & usable capacity
BMW’s 2021 launch information gives 83.9 kWh gross and 80.7 kWh net for the referenced battery. The 80.7 kWh preset should not be applied to every subsequent i4 version.
| Reference configuration | Original usable capacity | Provenance |
|---|---|---|
| 2021 launch eDrive40 / M50 — 80.7 kWh net | 80.7 kWh83.9 kWh gross — separate figure | Manufacturer · Source |
Charging capability
The launch press release describes DC charging up to 200 kW and battery thermal preparation. Peak DC power is not an average; use the time calculator’s explicit taper assumptions or a verified vehicle curve.
| Reference | AC limit | DC peak |
|---|---|---|
| 2021 launch eDrive40 / M50 — 80.7 kWh net | Confirm fitted equipment | 200 kW |
Keep the launch battery reference separate from later i4 versions
The cited 2021 launch document distinguishes 83.9 kWh gross from 80.7 kWh net for the referenced eDrive40/M50 battery. It lists DC charging up to 200 kW. These values should not be transferred to a later variant solely because it has an i4 badge.
For a matching configuration, a hypothetical current usable measurement of 74 kWh would imply 91.7% retention against 80.7 kWh. A report must identify its method and baseline before that calculation is useful. It does not establish capacity for an actual vehicle, and the eDrive40 and M50 should not be assumed to consume the same energy on your route.
Ask about the whole charging session, not just 200 kW
At the original usable reference, a 10–80% charge represents 56.49 kWh stored. Dividing that by the advertised 200 kW peak gives about 17 minutes, but this arithmetic assumes the peak is sustained and ignores losses. It is not a realistic manufacturer charging-time claim.
For illustration, applying a 60% average-power factor and 10% losses gives about 31.4 minutes in the calculator’s below-80% model. Neither assumption is a measured i4 charging curve. Compare the actual session window, station, temperature and battery preparation with the applicable documentation. Confirm the AC rate separately for home charging; the DC number does not describe the onboard AC charger.
Plan a journey with this battery reference
| Exact reference | At 18 kWh/100 km | At 22 kWh/100 km |
|---|---|---|
| 2021 launch eDrive40 / M50 — 80.7 kWh net | 314 km / 195 miles | 257 km / 160 miles |
Calculation: usable kWh × 0.70 ÷ kWh/100 km × 100. A used battery may have less usable energy; these scenarios do not establish its condition.
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Battery warranty
The cited launch release does not verify the warranty for your vehicle. Ask for original-market terms and any pack-replacement or repair documentation.
Things worth checking before purchase
- Confirm eDrive40 or M50 and the relevant build specification before using the capacity preset.
- Check tyre and wheel configuration when comparing real-world consumption.
- Ask the seller to demonstrate battery-preparation and charging functions supported by the car.
- Record battery warnings and any charging interruptions for professional assessment.
Turn the evidence into a useful estimate
Use a documented usable capacity and consumption from conditions matching your trip. Keep original specifications separate from the seller’s current battery-health evidence.
EVVerity estimates are informational and are not a substitute for a professional battery diagnostic or pre-purchase vehicle inspection.
Manufacturer sources & scope
- BMW — first i4 launch technical information
2021-06-02 · checked 2026-09-23
Source verification means the cited statement was reviewed. It does not extend a historical specification to other years or markets. Missing values are intentionally not inferred.
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Research another used EV
If you are considering more than one model, use its own guide to check the battery reference, charging equipment and seller evidence. Specifications and warranty terms must be verified separately for each car.