Battery Energy Density: LiPo and Li-ion Sourcing from China
1 resources tagged with "Energy Density"
Energy density (Wh/kg or Wh/L) is the spec buyers fixate on when sourcing LiPo and Li-ion cells from China, because it sets how much runtime fits in a given size and weight. Typical Li-ion cylindrical cells land around 250-270 Wh/kg, while LiPo pouches trade some density for form-factor flexibility. The trap is a quoted capacity that only holds for Grade A cells — Grade B or recycled cells can claim the same mAh on paper but lose density and cycle life fast, and all of them still need UN 38.3 to ship by air.
Energy density is the amount of energy a cell stores per unit mass or volume. When sourcing, the pitfall is accepting a datasheet number without verifying cell grade; we ask for the cell manufacturer (CATL, EVE, Lishen vs unbranded), capacity test logs, and UN 38.3 test summaries before approving.
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FAQ
What energy density should I expect from Chinese Li-ion cells?
Quality cylindrical Li-ion cells from tier-1 Chinese makers reach roughly 250-270 Wh/kg; LiPo pouches are usually lower but allow custom shapes. Be skeptical of any unbranded cell claiming far above that range at a low price.
How do I know if cells are Grade A or Grade B?
Request the named cell manufacturer and lot codes, run capacity and internal-resistance tests on a sample, and check cycle-life claims. Grade B cells are often reclaimed or out-of-spec stock sold at the same nominal capacity but with worse density and aging.
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