Lithium Battery Sourcing & Compliance from China
3 resources tagged with "Battery"
Battery sourcing decisions for wearables and small electronics hinge on two things: picking the right cell format (LiPo pouch for thin wearables, Li-ion cylindrical for higher density) and clearing transport and safety certification. The headline standards are UN 38.3 for air-freight transport safety (8 mandatory tests) and IEC 62133-2:2017 for cell and pack safety. A common pitfall is energy-density marketing — Grade A versus Grade B cells can differ 15–25% in real cycle life despite identical labels.
When you source a battery, the spec that bites later is cycle life under your actual C-rate, not the nameplate capacity. We confirm the UN 38.3 summary covers the exact cell and check whether the IEC 62133 certificate is cell-level or pack-level.
Guides (1)
Wiki (2)
FAQ
What is the difference between UN 38.3 and IEC 62133?
UN 38.3 is a transport safety standard required to ship lithium batteries by air. IEC 62133-2 is a product safety standard for the cell and pack itself, often required for CE marking. You typically need both.
How do I tell a Grade A cell from a Grade B cell?
Grade A cells come with consistent capacity and internal resistance and a traceable UN 38.3 report. Grade B cells are factory seconds with wider spec spread and shorter cycle life; sample testing exposes the difference.
How many tests does UN 38.3 require?
Eight: altitude simulation, thermal cycling, vibration, shock, external short circuit, impact/crush, overcharge, and forced discharge. The supplier should hand over a test summary covering all eight for your cell.
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