Compare usable and total battery-capacity figures in used-EV listings

The short answer

Only compare battery figures that use the same basis: usable against usable, or total against total. Usable capacity, often called net capacity, is the energy the car can actually draw on for driving, expressed in kilowatt-hours (kWh). Total capacity, often called gross capacity, is the larger theoretical figure for a fully charged pack, and it includes a protective reserve the driver cannot use. A listing that says only "77 kWh" or "82 kWh" without saying which one tells you little until you match it to the manufacturer's own definition for that exact battery variant.

One condition changes everything: both figures describe the battery as specified when new. Neither tells you how much capacity a particular used battery has today. That is a separate question, answered by battery-health evidence rather than by the spec sheet.

How manufacturers define the two figures

Škoda New Zealand, in a document dated January 1, 2026, defines net battery energy as the usable energy available for driving, in kWh. It describes gross energy as the higher, theoretical fully charged total that includes a protective reserve. Other manufacturers use similar paired labels, such as Porsche's "gross/net" energy content. The definition is a useful guide to what each word means, but the numbers themselves always belong to a specific model, battery and specification edition.

What the gap looks like in real specifications

Manufacturer tables that list both figures side by side show how much the two can differ, and that the gap is not a fixed amount across models.

Model and battery variant	Source edition	Gross (total) kWh	Net (usable) kWh	Difference	Net as share of gross
Škoda Enyaq / Enyaq Coupé 60	Enyaq brochure dated 10/2026 (technical pages marked not final)	61	58	3 kWh	about 95%
Škoda Enyaq / Enyaq Coupé 85, 85x and RS	Enyaq brochure dated 10/2026 (technical pages marked not final)	82	77	5 kWh	about 94%
Porsche Taycan (MY26)	Porsche Taycan technical data dated January 6, 2026	89.0	82.3	6.7 kWh	about 92%
Porsche Taycan with Performance Battery Plus, option J9Q (MY26)	Porsche Taycan technical data dated January 6, 2026	105.0	97.0	8.0 kWh	about 92%

Two practical lessons come out of this table. First, model badges are not capacity figures: an Enyaq 85 has 77 kWh usable and 82 kWh total, not 85 of either. Second, mixing bases distorts comparisons. Set a Taycan's 82.3 kWh net figure against an Enyaq 85's 82 kWh gross figure and the two packs look almost identical, when the Taycan actually has about 5 kWh more usable energy (82.3 versus 77).

These pairs come from the editions named above and apply to the configurations those documents describe. They are not the build record of any individual used car, so a car from a different model year, market or option package needs its own matching specification.

Steps for comparing two or more listings

• 1. Record what each listing actually says: the kWh number and the exact wording around it, such as "usable," "net," "total," "gross" or nothing at all.
• 2. Identify the exact vehicle: model year, market, trim and, where possible, the battery variant or option code (for example, a Taycan with or without Performance Battery Plus, J9Q).
• 3. Find the manufacturer's specification for that variant and note its date and edition, since figures can be revised between brochures and model years.
• 4. Check that the manufacturer's document labels the figure as gross or net, and confirm the listing's number matches one of them.
• 5. Compare only like with like. If one listing gives usable and another gives total, convert using the manufacturer's paired figures for each car rather than applying a generic percentage.
• 6. If a figure cannot be matched to a labeled specification, treat its basis as unknown and leave it out of any usable-capacity ranking.
• 7. Keep range, energy consumption and battery-health information in separate columns; none of them substitutes for a capacity figure, and capacity does not substitute for them.

A simple comparison ledger

Laying each candidate out on the same fields makes basis mismatches obvious before they skew a decision.

Field	What to record
Vehicle	Model year, market, trim
Battery identifier	Battery name, badge or option code
Advertised kWh	The number exactly as listed
Listing wording	Usable/net, total/gross, or unlabeled
Manufacturer figures	Gross and net for the matched variant
Source edition	Document date and status
Configuration match	Confirmed, likely, or unresolved
Range	Rated figure and test cycle
Consumption	Rated kWh per distance and test cycle
Battery health	Any state-of-health report or test result, with date

Worked example (hypothetical)

Listing A advertises 60 kWh usable. Listing B advertises 64 kWh with no definition. B looks bigger, but you cannot rank them on usable capacity yet, because B's 64 kWh could be a total figure. Suppose the manufacturer's documentation for B's exact variant shows 64 kWh total and 60 kWh usable. The two cars then carry the same usable energy when new. The 4 kWh difference in B's figures is the built-in reserve; it is not a sign of degradation, it says nothing about how much capacity B's battery has left today, and it does not guarantee any particular range.

Keep range and consumption separate

Capacity is stored energy; range is how far that energy takes the car under a test procedure, and consumption is how much energy the car uses per distance. Škoda's Enyaq brochure, for instance, lists range separately in WLTP kilometers and consumption in kWh per 100 km. WLTP is the European test cycle, so its figures are not interchangeable with US EPA ratings, and a European brochure range should not be compared directly with an EPA range from another listing. A car with less usable capacity but lower consumption can travel as far as one with a larger pack.

Where battery condition fits

Once you know each car's usable capacity when new, the remaining question is how much of it the specific battery still delivers. That comes from condition evidence for that vehicle, such as a dated battery state-of-health report or a test arranged with a dealer or technician, not from the specification table. Record it separately so that a strong spec figure never stands in for a healthy battery, and a weak health result is judged against the correct usable baseline.

Choosing between listings

Once every candidate is on a usable-capacity basis, decide based on how you drive. If long trips matter most, compare usable capacity together with rated consumption from the same test cycle, then weight the result by each car's documented battery health. If daily use is short and home charging is available, a smaller usable pack in good condition may serve as well as a larger one at a lower price. In every case, a listing whose capacity basis or battery variant cannot be confirmed should be treated as unresolved until the seller or the manufacturer's documentation fills the gap.