The hidden challenge of fast charging: a battery that wears out unseen

The challenge is that fast charging quietly wears out the battery. A pack that mostly fast charges loses about twice as much capacity a year as one on slow charging. The charging software never sees that cost.

With health charging a pack degrades up to 14% less over 100,000 km. A charging provider can keep the battery guarantee it signs for a ten year contract. A logistics company protects its cost per kilometre and its resale value.

A charging plan for every bus and truck at the depot

Health charging works out a charging profile for every session. It trims the harshest peak in the current, so the battery ages more slowly. The charge itself stays at a similar speed. The charger or charging software carries out the profile, and the driver does nothing.

Health charging balances the charger and the vehicle with live data from both. The charger and the battery are monitored together, and AI keeps every session within safe heat and power settings. Each vehicle gets its own charging curve, which keeps it optimised even as the battery ages.

Fleet charging providers and logistics companies use health charging to charge buses, trucks and vans at the depot without wearing out the battery. Battery swap station operators use it to charge the packs in the pool.

Why trusting the supplier’s own number is a challenge

The problem is that the health figure usually comes from the supplier’s own battery management system (BMS). Yet that same supplier pays when the guarantee is broken. The owner is asked to trust a number from the party with the most to lose.

Warranty payouts depend on the State of Health (SoH), so suppliers have little reason to share it. Many do not show it at all. The figures that are shared tend to be conservative, holding back capacity that is only released later in the battery’s life.

With an independent figure per pack, a leasing company sets residual values on the real battery. A storage operator claims against the guarantee when capacity drops too fast. An insurer prices the premium on the pack itself.

An independent SoH figure, not the supplier’s

Battery protect reads each battery’s usable capacity from its own operating data. It does not rely on the number from the manufacturer’s BMS. It also forecasts what will be left in 5 to 10 years. That forecast drives the residual value.

Battery protect is used by leasing companies, grid scale storage operators, fleet charging providers, logistics companies, battery swap station operators and insurers. They use it to see the real state of health of each pack, compared to what the supplier guarantees.

The challenge inside every storage battery: one weak cell holds it back

The challenge is that one weak cell holds back the whole battery. The system stops early to protect it, so up to 10% of the energy stays unsold while it is physically still there.

Every recovered kWh is energy the trading partner (optimiser) can sell, on hardware that is already paid for. Revenue swung between £41,000 and £70,000 per MW in one quarter. More sellable energy lifts revenue per MW against the market average.

The gap between rated and delivered capacity, closed

A storage battery rated at 800 kWh rarely delivers 800. Cells drift out of balance and cautious cut offs leave 5 to 10% unused. Capacity unlock finds that gap and closes it. It always stays inside the manufacturer’s limit.

Capacity unlock uses coulomb counting, which measures the charge flowing in and out of the battery. That shows the real capacity live in the system, without a manual capacity test. On site, a BMB edge unit runs next to the battery. It shares the result directly with the battery management system (BMS) or energy management system (EMS), so the system acts on it instead of only showing a number in a portal.

Capacity unlock is used by grid scale storage operators and logistics companies to get more energy out of batteries they already own. It runs on live data, through a small edge unit on site or a software link (API).

When the vehicle says all is fine, that is the real challenge

The problem is that the battery’s own system often says everything is fine. In a 2026 study of 1,114 vehicles, it missed 93% of the worst packs.

Fleet operators know the evening before which truck or bus will not make its route. They plan another vehicle instead of facing a missed delivery or a contract penalty. Storage operators spot the weak cell without waiting for the yearly test. And because every cell is monitored continuously, insurers get the data they ask for. That helps lower fire insurance premiums for depots and storage sites.

Real time alerts on every cell

Anomaly detection watches every battery cell in real time. When a cell runs hot or drifts out of balance, it raises a flag long before the next test. Battery protect looks at the whole pack. Anomaly detection finds the one cell that is off.

Anomaly detection is used by grid scale storage operators, logistics companies, fleet charging providers, leasing companies and insurers. They use it to catch a battery problem before it turns into downtime or damage.

No battery record, no bid: the remarketing challenge

The problem is that the battery is not on the hand back checklist, even though it is the most valuable part of the car. Without a battery health record, 45% of trade buyers will not even bid.

In vendor studies, a used EV with a documented battery sells for around 4% more, and a week faster. That lifts the margin on every returned car. Insurers can repair more damaged packs instead of writing them off.

An independent record for every hand back, sale or claim

Usage certificate is an independent record per battery. It shows the charging history, the stress, the measured capacity today and the forecast. It is issued at hand back, sale or claim, with a unique certificate ID and a QR code to the digital version. It lists the usable energy and WLTP range today against new, a 12 month forecast and an ageing rating compared with similar vehicles. The certificate is designed to meet VDE requirements. From 2027 the manufacturer issues the EU battery passport, but cannot fill in this part.

Leasing companies, logistics companies, battery swap station operators and insurers use the usage certificate. It proves the condition of a battery to a buyer, an insurer or the regulator.

Who pays for a shared battery? The challenge of swapping

The challenge is that a swapped battery has no single owner. It moves between vehicles, chargers and owners, and nobody keeps track of who used it and how much.

Every swap is billed to the right party. The station earns on each swap, and a car station needs 60 to 70 a day to break even. The battery owner is paid for the use of its packs.

Each party in a swap gets its own invoice

A battery swap involves four parties: the driver, the fleet owner, the station and the battery owner. Battery swap settlement works out who pays what. It links to fuel and charge cards and sends each party its own invoice. It runs in China, not yet in Europe.

Battery swap settlement is used by battery swap station operators to bill every swap correctly, even when the battery belongs to someone else.

The challenge no lease contract sees: how drivers charge

The problem is that the way a driver charges only shows at the end of the contract. Two identical cars can come back six percentage points of battery capacity apart, and the lease company never saw it coming.

With better charging, a pack degrades less and keeps more of its value. That lowers the monthly depreciation, the biggest cost in the lease price. The leasing company can then offer a lower price in the next tender.

Lease drivers charge in a way that protects the battery

Driver app gives each driver a charging score, tips and feedback. It is for places where BMB cannot reach the charger, like a leased car charged at home or on the road. There, the driver’s habits are what protect the battery.

Driver app is used by leasing and remarketing companies to steer how their drivers charge during the contract.