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Battery-as-a-Service: Decoupling the Asset.
"The battery is not a part; it is a fuel tank that degrades. Treating it as a separate asset unlocks mass adoption and circular value."
-20%
Upfront EV cost reduction when battery is leased under BaaS.
(NIO BaaS model, battery = ~40% of EV cost removed from sticker, 2024)
(NIO BaaS model, battery = ~40% of EV cost removed from sticker, 2024)
2nd Life
Batteries retain 70%+ capacity for grid storage after their automotive lifecycle.
(PMC/NCBI, peer-reviewed, multiple sources)
(PMC/NCBI, peer-reviewed, multiple sources)
The Fusion Equation
Performance × Responsibility = Value
Performance
Adoption Rate
Responsibility
Lifecycle Management
"Until the technology reaches a point where batteries can be fully charged in less than 3 minutes without damaging the battery chemistry, battery swapping will have overwhelming advantages." — William Li, CEO NIO, Beijing Auto Show, April 2024
The core tension
The battery is not a component. BaaS reframes it as a managed asset: leased, recovered at end-of-automotive-life, and redeployed into grid storage. The manufacturer earns margin from the same cell twice.
The battery is not a cost. It is the business model.
The analytical depth
Battery = 40% of EV cost. Until this changes, the price gap with combustion stays.
NIO: 80 to 90% of buyers subscribe rather than own. Same car. Different contract.
100 million swaps completed since 2018, the milestone reached on 6 February 2026. Average time: 3 minutes. Zero range anxiety.
The ownership model is the problem, not the technology.
When the manufacturer retains the asset, the economics invert entirely.
Monthly subscription revenue replaces the one-time sale.
The battery returns at end-of-automotive-life at 70%+ capacity.
It goes directly into grid storage: a second margin from the same cell.
The cell does not change. The contract does.
NIO
BaaS Pioneer · 3,750+ Swap Stations · Battery Asset Management
100M+
Battery swaps completed by NIO since 2018. The 100 millionth was reached on 6 February 2026. Network: 3,750+ stations in China and 61 in Europe. In China, 80 to 90% of NIO buyers subscribe to BaaS rather than purchasing their battery outright.
(William Li, CEO NIO, 2025)
CATL's EVOGO platform (operating under the Choco-Swap brand) reached 1,020 battery swap stations across China by end-2025, with a target of 3,000 by end-2026. Swap time: 100 seconds. Unlike NIO's proprietary network, Choco-Swap was designed from the start for universal compatibility: FAW, Changan, BAIC, Chery, GAC, SAIC, and Wuling all build models compatible with the standardised Choco-SEB battery block. For commercial fleets, CATL's Qiji Energy subsidiary operates 305 heavy-duty truck swap stations. CATL's model answers the question NIO cannot yet answer in Europe: who holds the battery assets when there is no Mirattery equivalent? The answer is the world's largest battery manufacturer.
"NIO's battery asset management company, Mirattery (Wuhan Weineng), holds the battery inventory off the manufacturer's balance sheet, funded by CATL and institutional investors. This separates the financial liability from the operational model: NIO sells the car, leases the battery, and earns subscription revenue while Mirattery manages the asset. The circular logic closes when retired automotive batteries enter grid storage, monetising the same cell a second time."
The circular logic closes when retired automotive batteries enter grid storage, monetising the same cell a second time.
Performance
Adoption Rate
The battery is 40% of the cost of an EV. As long as it is bundled with the car, the sticker price blocks mass-market adoption. BaaS decouples the two: sell the chassis at near-parity with a combustion car, lease the battery monthly. The barrier to entry collapses. The addressable market multiplies. The manufacturer earns recurring revenue from the asset it used to sell once.
Responsibility
Lifecycle Management
A battery sold is a battery lost. When the manufacturer retains ownership through a lease, it gets the asset back at end-of-automotive-life, still at 70%+ capacity. That battery goes directly into grid storage: a second revenue stream from the same cell. Circular by design, not by aspiration. The responsibility metric is not a cost: it is the source of the second margin.
Download the full case
PDF · 7 slides · Free access · Downloaded 9 times
Unresolved tensions
Will fast-charging technology render battery swapping obsolete?
Can BaaS scale beyond China without a battery asset management ecosystem?
Who sets the standard? Proprietary networks vs universal compatibility.
By Fabrice Macarty
This case resonates?
The contract is the strategy. The battery is just the asset it governs. Most manufacturers have it the wrong way round.
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