Gross vs net battery capacity is the most expensive piece of small print in an electric car. The number on the brochure is rarely the number you get to use.
On one premium EV, believing the bigger figure hands you 34 kilometres of range that does not exist. Here is how to read it properly.
Gross vs Net Battery Capacity: What's the Difference?
Two numbers describe the same battery, and they are not interchangeable.
Gross capacity is the pack's total rated energy. It is the whole box, measured in kilowatt-hours.
Net capacity is the part the car will actually let you use. It is also called usable capacity.
The difference between them is the battery buffer. It is not a separate set of cells sitting idle somewhere.
It is simply a limit the battery management system enforces. The software refuses to charge to the absolute top or drain to the absolute bottom.
Only one of these two numbers determines how far you can drive. It is the net figure, and it is the one brochures are least likely to print.
Audi Publishes Both. Here Is What the Gap Costs You.
Audi is unusually straight about this, so it makes the clearest example.
Its official technical page for the Q6 e-tron states "a total gross capacity of 100 kWh (94.9 net)". Audi's main site repeats it.
| Audi Q6 e-tron | Figure |
|---|---|
| Gross capacity | 100 kWh |
| Net, usable capacity | 94.9 kWh |
| Buffer | 5.1 kWh, or 5.1 per cent |
| Claimed range | Up to 625 km |
Now do the sum that matters. At 625 kilometres on 94.9 usable kilowatt-hours, the car is using about 15.18 kWh per 100 km.
Keep that consumption and run it against the 100 kWh gross figure instead. You get 659 kilometres.
Audi claims 625. So using the headline number rather than the usable one invents 34 kilometres of range that is not there.
That is a 5.4 per cent error, which sounds academic until it is the difference between reaching a charger and not reaching one.
One fair criticism of even this good example. Audi does not name the test cycle for its own range figure anywhere on those pages.
So the brand that gets gross versus net exactly right still leaves you guessing on how the range was measured. These are two halves of the same problem.
Why Manufacturers Reserve Capacity
A buffer is not a trick. It is there because the extremes of a lithium battery's range are where it ages fastest.
Holding a cell at a very high state of charge stresses it. So does running it to genuinely empty.
By refusing to use those extremes, the manufacturer trades a few kilometres of range for a longer battery life. That is a trade most owners would choose.
It also makes the warranty possible. A maker promising a minimum capacity after eight years needs headroom to deliver it.
One caution on how you read any buffer figure. Knowing the gross and net numbers does not tell you how the buffer is split between the top and the bottom of the range.
Audi publishes the two totals and nothing about the split. Anyone telling you how much is reserved at each end is guessing.
Does 0 Per Cent Mean the Battery Is Empty?
Chemically, no. There is still energy in the cells when the dashboard reads zero.
The display is calibrated to the usable window, not to the chemistry. Zero on the screen means the bottom of what the car permits.
But do not treat that as spare range. The reserve exists to protect the battery, not to get you home.
The car will reduce power and then stop. Planning around an invisible reserve is how people end up on a flatbed.
Does Net Capacity Decide Your Range? Not on Its Own
This is where most buyers go wrong, and the fix is one piece of arithmetic.
Range is usable capacity divided by consumption. Divide your usable kilowatt-hours by consumption per 100 km, then multiply by 100.
So capacity is only half the equation. Weight, aerodynamics, drivetrain, tyres, speed and temperature all set the other half.
And the best proof of that comes from a single manufacturer selling the same battery in two cars.
The Same 100 kWh, Two Different Ranges
ZEEKR's official 7X model page lists three versions, and the numbers teach the whole lesson.
| ZEEKR 7X | Capacity | Range | Per 100 km |
|---|---|---|---|
| RWD | 75 kWh | 480 km WLTP | 15.62 kWh |
| Long Range RWD | 100 kWh | 615 km WLTP | 16.26 kWh |
| Performance AWD | 100 kWh | 543 km | 18.42 kWh |
Capacity and range figures are ZEEKR's. The consumption column is our own arithmetic from the advertised capacity.
Look at the bottom two rows. Identical batteries, 72 kilometres apart.
The all-wheel-drive version uses 13.3 per cent more energy per kilometre. Two driven axles cost energy, and no battery size fixes that.
Now look at the top row, which is the detail nobody mentions. The 75 kWh car is the most efficient of the three.
It uses 15.62 kWh per 100 km against the 100 kWh model's 16.26, making it about 3.9 per cent more efficient. A smaller pack is lighter, and lighter cars use less.
There is a second surprise in the charging figures. The 75 kWh pack accepts up to 450 kW, while the 100 kWh pack accepts up to 420 kW.
The bigger battery takes less peak power, and goes from 10 to 80 per cent in 16 minutes against the smaller pack's 13.
Two important cautions on this table. ZEEKR never says whether these capacities are gross or net — every one is labelled only "Battery Capacity".
So our consumption column is calculated from the advertised figure. If the usable capacity is lower, the real consumption is lower too.
And notice the third row. ZEEKR labels 480 km and 615 km as WLTP, but does not label the 543 km figure. Always check which cycle a range came from.
Why Your Electricity Bill Exceeds the Battery's Capacity
Owners notice this quickly. The meter records more units than the battery seems to have gained.
Energy is lost converting mains alternating current into the direct current a battery stores. Heat accounts for much of it.
The car is also awake during a charge, running its cooling pumps and electronics. That draw comes off the same meter.
Work an example on an 80 kWh usable pack. Charging from 20 to 80 per cent adds 60 per cent, which is 48 kWh into the battery.
Assume 90 per cent charging efficiency and you would draw about 53.3 units from the wall. Roughly 5.3 units are lost.
Treat that 90 per cent as an illustration only. It is a hypothetical assumption, not a measured result for any particular car.
Real efficiency varies with the charger, the cable, the temperature and the charging speed. Slow AC charging is usually the least efficient of all.
The practical lesson for a Pakistani owner is simple. Budget your electricity on units drawn, not on the battery's rating.
Why Some Makers Suggest an 80 Per Cent Limit
You will have heard that charging to 100 per cent harms the battery. The truth is more specific than that.
Advice depends on the cell chemistry, and the two common types behave differently near the top of their range.
But please do not take a blanket rule from the internet. There is no universal law that every LFP car wants 100 per cent and every nickel-based car wants 80.
Some makers ask for a periodic full charge so the battery management system can recalibrate its reading. Others advise a daily ceiling.
Both instructions can be correct for their own cars. Follow your own owner's manual and nothing else.
If a salesperson gives you a charging rule, ask them to show you where the manufacturer wrote it down.
Buffer and Degradation Are Not the Same Thing
These two get mixed up constantly, and keeping them apart is the mark of someone who understands batteries.
A buffer is a design decision, fixed at the factory. The Audi's 5.1 kWh was reserved before the car was built.
Degradation is a change in condition that happens over years of use. The pack's total ability to hold charge slowly falls.
So a buffer does not grow. A battery ages. Those are different phenomena with different causes.
The measure for ageing is state of health, usually written as SoH and given as a percentage of the battery's original condition.
A proper diagnostic read is worth far more than the range estimate on the dashboard. That estimate reflects recent driving, not battery condition.
What EV Buyers in Pakistan Should Ask
This is not a foreign problem. It is on Pakistani manufacturer pages right now.
iCAUR publishes 81.76 kWh for the V23 on its own Pakistani site. It does not say whether that figure is gross or net.
We noted the same thing when covering iCAUR V23 and V27 pricing and bookings. The capacity is published; its status is not.
So ask the dealer four questions, in writing, before you pay anything.
First, is the advertised capacity gross or net, and what is the usable figure in kilowatt-hours? Get the number, not a reassurance.
Second, which test cycle produced the range claim? A CLTC figure and a WLTP figure are not comparable, and both flatter a car more than real driving does.
Third, what exactly does the battery warranty cover? Ask for the years, the kilometres, and the minimum state of health it guarantees.
Fourth, where will the battery be serviced, and by whom? A warranty is only as good as the workshop that can honour it.
For a used EV, add a fifth. Insist on a documented state-of-health report and ask how it was measured.
Across the market, disclosure varies widely. See our coverage of the locally assembled JAECOO J5 BEV, and of the Deepal S05 against the Geely Starray EM-R.
Which Number Should Decide Your Purchase?
Neither one, on its own. That is the honest answer.
Use net capacity for range arithmetic, because it is the only figure that reflects energy you can actually spend.
But judge the car on consumption per 100 kilometres, which is the number that tells you how well it uses what it has.
The ZEEKR table proves why. The most efficient of those three cars is the one with the smallest battery.
And if a brochure gives you one capacity figure with no label at all, treat that as information about the manufacturer. Companies confident in their numbers publish both.
As more electric cars arrive here, this disclosure will matter more. Our piece on Pakistan's 2030 EV target and fuel prices sets out the direction.
Final Thoughts
Three things to carry away. Net capacity is the only figure that drives range, and the buffer is a design choice rather than a defect. Consumption per 100 km decides more than battery size ever will.
Audi publishes 100 kWh gross and 94.9 net, and the 5.1 kWh gap is worth 34 kilometres of imaginary range. ZEEKR publishes neither label, which is why its three variants need arithmetic before they make sense.
If a dealer cannot tell you the usable kilowatt-hours and the test cycle behind the range, you have learned something useful about the car.
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Frequently Asked Questions
What is the difference between gross and net EV battery capacity?
Gross is the pack's total rated energy. Net is the portion the car permits you to use, and it is also called usable capacity. Audi's Q6 e-tron, for example, is published as 100 kWh gross and 94.9 kWh net.
What is a battery buffer?
The gap between gross and net, held back by the battery management system to protect the cells. It is a software limit rather than a separate group of cells. Knowing the two totals does not tell you how the reserve is divided between the top and bottom of the range.
Does a bigger battery always mean more range?
No. ZEEKR sells two 7X variants with the same advertised 100 kWh and ranges 72 km apart, because the all-wheel-drive version uses more energy per kilometre. Its 75 kWh version is actually the most efficient of the three.
How do I calculate range from battery capacity?
Take the usable kilowatt-hours, divide by the car's consumption figure for 100 km, and multiply the result by 100. Always start from the net number. On the Audi example, starting from gross invents about 34 km of range.
Why does charging draw more units than the battery holds?
Energy is lost converting mains power for storage, mostly as heat, and the car runs its own electronics throughout a session. Put 48 kWh into a pack at a hypothetical 90 per cent efficiency and the meter records roughly 53.3 units.
Does 0 per cent mean the battery has no energy left?
Not chemically. The gauge is calibrated to the usable window, so zero means the bottom of what the car allows. Do not treat the remainder as spare range, because the car will cut power rather than let you use it.
Is charging to 100 per cent bad for the battery?
It depends on the chemistry and on the maker's instructions, and there is no universal rule by battery type. Some manufacturers ask for an occasional full charge so the system can recalibrate. Follow the manual for your exact model.
What is battery state of health?
A percentage comparing the battery's current condition with its original condition. It measures ageing, which is a different thing from the factory-set buffer. A diagnostic report is far more reliable than the range estimate on the dashboard.
How do I check a used EV battery in Pakistan?
Ask for a documented state-of-health report and for the method used to produce it. Confirm what remains of the battery warranty, including the minimum health it guarantees, and check which workshop can actually service the pack locally.
