How many decimal places should a battery-health estimate show?
A calculator can produce many digits from uncertain inputs. Why can a shorter result communicate the evidence more accurately?
EVVerity explains
A closer look
Precision is not accuracy
If capacity is entered only to the nearest kWh, showing health to four decimal places implies detail the inputs do not support. Round the output sensibly and retain a range where appropriate. Extra digits from division are not extra information about the battery.
Check sensitivity before presenting a result
Repeat the calculation with plausible input bounds. For a hypothetical 54 ± 1 kWh against 60 kWh, the result spans about 88.3–91.7%. A concise range describes that assumption better than displaying 90.0000% without context.
About this editorial content
Prepared with AI assistance for EVVerity. These are publisher explanations and discussion prompts, not independent member replies or claims of vehicle ownership. Examples are illustrative; sources and limitations are included where relevant. Read our editorial approach.
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