Why does a grading cabinet reveal whether a factory is genuine?

A grading cabinet measures each cell's real capacity and internal resistance and groups cells that match. Without one, the factory can only trust the supplier's labelled capacity, and poorly matched cells create a weakest-link effect that pushes cycle life well below the rating. Whether a grading cabinet exists is a hard indicator of whether the process actually runs.

How do I read burn-in cabinet specs?

Check whether the voltage and current ceiling covers your product. A 48V storage system needs at least 60V range. For high-current packs, look at the current ceiling. The number of cabinets sets how many units can be cycled at once, which directly affects lead time and monthly output.

What Testing Equipment a Real Battery Factory Owns

Inside a Dongguan storage factory's own test centre: 100V/60A and 60V/50A burn-in cabinets, a capacity-grading cabinet, a 3000W laser welder, a 100V/320A综合 tester, and an integrating sphere. Plus two semi-auto PACK lines and three assembly lines.

Most buyers judge a factory by floor area and sample finish. Both can be dressed up. Test equipment is harder to fake, because the equipment costs money and whether it is actually used shows in its condition.

What is in the test centre

We run two in-house test centres, one for street lights and one for storage. The main storage equipment:

**Burn-in cabinets**: one 100V/60A unit, two 60V/50A units, plus a cabinet dedicated to portable storage units. These run assembled packs through full charge and discharge cycles that simulate real use.

**Capacity-grading cabinet**: one unit. It measures each cell's real capacity and internal resistance and groups cells that match.

**Comprehensive tester**: 100V/320A, for loaded performance testing.

**Laser welder**: 3000W, used on cell terminals.

**Integrating sphere**: measures optical parameters for street lights.

**Transformer bank**: one set, powering the line and test equipment.

Line configuration

Two semi-automatic PACK lines and three assembly lines.

Semi-automatic means the steps where consistency matters, welding and testing, are handled by equipment, while assembly and wiring, which need human judgement, are done by people. Full automation is not practical in storage: specifications change too often, and a just-launched custom model does not justify a fully automated line.

Why the grading cabinet is the key one

Whether a grading cabinet exists is a hard indicator of whether the factory actually runs the process.

Without one, the factory can only trust the cell supplier's labelled capacity. When cells with different real capacities are grouped into a pack, a weakest-link effect appears: the smallest cell decides how much energy the pack can deliver, and it also over-discharges first, so pack cycle life falls well below the rating.

A factory that owns a grading cabinet and will show you its grading data is running the process.

How to read burn-in cabinet specs

Two dimensions: range and count.

Range is whether the voltage and current ceiling covers your product. For a 48V storage system you need at least 60V of range. For high-current packs, check the current ceiling.

Count sets how many units can be cycled at the same time, which bears directly on lead time. A factory with too few cabinets compresses burn-in duration or switches to sampling when orders pile up.

Qualifications

We are a national high-tech enterprise with more than 30 patents across invention, utility model, and design, and our certifications are complete. We have served over 1,000 customers in China and abroad.

What this list does not tell you

Equipment shows capability. It does not show current availability. A factory whose order book is full keeps you waiting regardless of how well equipped it is.

So after the equipment questions, ask one more: how far out is the line booked.

FAQ

Why does a grading cabinet reveal whether a factory is genuine?
A grading cabinet measures each cell's real capacity and internal resistance and groups cells that match. Without one, the factory can only trust the supplier's labelled capacity, and poorly matched cells create a weakest-link effect that pushes cycle life well below the rating. Whether a grading cabinet exists is a hard indicator of whether the process actually runs.
How do I read burn-in cabinet specs?
Check whether the voltage and current ceiling covers your product. A 48V storage system needs at least 60V range. For high-current packs, look at the current ceiling. The number of cabinets sets how many units can be cycled at once, which directly affects lead time and monthly output.

Want the factory walkthrough video or a quote? Contact us with your application and our engineers will spec a system.