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Key prefixes printed on 18650/21700 Lithium-ion batteries denote their cathode chemistry, which determines performance, safety, and applications. Below is a breakdown of common prefixes and their meanings: Prefix Full Name Chemistry Key Traits Common Uses Safety IMR Lithium Manganese Rechargeable LiMn₂O₄ High discharge (15–30A), stable Power tools Safer ICR Lithium Cobalt Rechargeable LiCoO₂ High capacity, low discharge Laptops, cameras Risky INR Lithium Nic …