Charger Quality & Inspection
Quality is not a certificate on the wall. It is a set of gates, each one placed where a defect is still cheap to fix. This guide covers what those gates are and how to write them into the order.
Three routes, and you only need one of them
Setting up inspection, reading a batch report, and dealing with a failed shipment are three different jobs. Start with the one you are actually doing.
Set up inspection
The gates have to exist before the first batch, and they belong in the purchase order rather than in a conversation.
Read the evidence
A batch report is only useful if you can read it and disagree with it.
Handle a failure
When a batch fails, the process matters more than the argument. These are the mechanics of closing a defect out.
Five places a defect is still cheap to fix
The cost of a defect rises at every stage it survives. These are the gates that catch it early.
Incoming inspection
Components are inspected before they reach the line, because a bad connector found at incoming costs a fraction of the same connector found in a finished unit.
First article and sample approval
The first unit off the line is compared against the approved sample. This is the gate that catches a supplier changing something quietly.
In-line electrical test
Every unit is tested, not sampled. Electrical function is the one attribute where a 100% check is usually economic.
What to do when the batch does not pass
The plan for a failed batch is written before the batch, not after it.
Contain before you investigate
The first action is stopping anything else from shipping, not finding the cause. Containment and root-cause analysis are separate steps and should never be merged.
Rework has rules
Rework is acceptable when it is defined, recorded and reinspected. Rework that is improvised on the line is how a defect reaches the customer twice.
Traceability decides the blast radius
If the batch can be traced from component to carton, a defect can be contained to specific serials. Without it, the whole shipment is suspect.
What actually decides whether quality holds
Whether the gate is written into the PO
An inspection step that lives in an email is optional. The same step in the purchase order is enforceable.
Who signs off the sample
Sample approval is the reference point for every later argument. If nobody signed it, nobody can prove the batch changed.
Whether defects come back to the line
A defect report that stops at management changes nothing. The feedback has to reach the station that made the defect.
Whether the components can be replaced
A single-sourced critical component turns someone else’s factory shutdown into your delay. Second sourcing is a quality measure as much as a supply one.
Where to go from here
Four guides that pick up where this one stops.
Quality and inspection questions
What is an AQL inspection and should I use one?
AQL is a statistical sampling standard: it defines how many defects in a sample are acceptable. It is useful for cosmetic and packaging checks, and less useful for electrical safety, where a 100% test is usually the right call.
Should I pay for a third-party inspection?
For a first batch from a new factory, usually yes — an independent inspector is evidence that does not depend on the supplier’s own report. After a few clean batches, in-house gates often replace it.
What is 8D and why does it matter?
8D is an eight-step method for closing out a defect: contain, find the root cause, fix it, verify the fix and prevent recurrence. It matters because it forces a permanent corrective action rather than a rework.
How do I check batch traceability?
Ask the factory to trace one finished unit back to its component lots and forward to the carton and shipment. If that walk-through cannot be done, the traceability claim is documentation rather than a system.
What is a reasonable defect rate for chargers?
A well-run line targets a low single-digit rate on cosmetic defects and something much lower on functional ones. The number matters less than the trend and whether the same defect appears twice.
Ask us for the inspection plan on your product
Tell us the product and the market, and we will send the gate list we would run it through — incoming inspection, in-line test, sample approval and batch reporting.