OWNER ANSWER
Why charging kWh does not match your BYD’s battery percentage
The kWh on a charging receipt includes energy used during charging, while the battery percentage shows an estimate of stored charge. Conversion losses, battery temperature control and cabin systems can make the receipt higher than the energy added to the battery.
- Match the receipt to the actual session using its charger, date and start/end times, then use the car’s percentages from that same session.
- Use the correct usable battery capacity if it is known.
- Estimate stored energy as usable capacity in kWh × (finish percentage − start percentage) ÷ 100. For a hypothetical 60 kWh usable battery going from 20% to 70%, that is 60 × 50 ÷ 100 = 30 kWh. This example is not a BYD battery specification.
- Compare that estimate with delivered kWh. If the example receipt is 34 kWh, the difference is 4 kWh and 30 ÷ 34 is about 88%. This is an estimate for that session, not a fixed acceptable-loss threshold or a battery-health test.
- For home charging, separate the charger reading from a whole-house meter that also includes other appliances.
What to expect
You have compared supplied kWh with an estimate of stored energy for the same session. A difference can include charging losses and rounding; this calculation alone cannot measure battery health.
If that did not work
For a billing discrepancy, ask the operator or supplier to check the session meter and receipt. For a repeated unusual difference with charging warnings, give BYD comparable session details rather than interpreting the calculation as a battery diagnosis.
For a billing query, first compare billed energy with the charger’s own final kWh, not the battery estimate. If the receipt uses a per-kWh price, multiply that rate by delivered kWh and check any separately listed fees. If those figures disagree, send the operator the receipt and charger/session ID; if they agree but stored energy appears low, compare charging conditions and vehicle messages before alleging a meter fault.
kW and kWh
kW is the rate; kWh is the energy delivered over time. AC charging converts power in the car; DC follows a different path but still uses energy for losses and supporting systems. Gross battery capacity and usable energy are different figures.
Related links
Source: Osprey Charging · Octopus Electroverse. Checked 22 October 2026.
Sources for these additional checks, reviewed 13 November 2026: Official support guidance.