BY RENAUD ANJORAN
As you look at the products you manufacture in China, you need to evaluate the risks that something goes wrong.
When it comes to electrical products, one of the major risks is that the supplier uses substandard components in order to earn more profit.
From experience, the risk is particularly high with batteries. The product might work fine during an open-the-box-and-turn-the-product-on inspection, but might have a very small capacity.
There are basically 4 options to check the battery capacity in a final inspection.
Option 1: off-site test
All electrical testing labs, as well as our Shenzhen office, have a battery capacity tester. It is one of the most basic testing devices.
Typically, the inspector takes a few samples of batteries and sends them to the off-site testing place. After that, the tester needs to be set up, and it needs to be operated (for several cycles). The point of doing several cycles is to check that the batteries can actually be discharged and recharged, and to have a better idea of average capacity over time.
Option 2: accelerated testing
Ideally, all could be done on site, in the factory, without sending any batteries. But it takes a long time, often 8 hours or more. The inspector often needs to go back (catch the last bus, work on reporting, etc.)
So, why not accelerate it? It would be easy, if not for a non-linear relationship because of internal heating (extra energy loss).
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