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ICR - I = Lithium, C =cobalt , structure = LiCoO2 are the usual type of LiIon batteries, Low drain but longer charge stay and battery life.
IMR - I = Lithium, M = Manganese, structure = LiMn2O4 has less capacity and can deliver higher current.
IFR - I = Lithium, F - Ferrous (a.k.a Iron), structure = LiFePO4 is a lower voltage.
NCR - N = Nickel, C = Cobalt ?? R = Rechargeable Newest type, High drain with longer charge stay and battery life
NCR Li-Ion batteries are a new standard in the Lithium ion world. This chemistry of these batteries are LiNiCoAlO2. They are referred to as "NNP" batteries, high drain similar to the IMR batteries but the AlO2 (Aluminum Dioxide) is used as an insulator. It coats the electrodes of the cell which protects again the number one enemy of Li-Ion cells. What is that enemy you ask? HEAT. The metal oxide coating (interior of the battery) significantly increases the safety of the battery by reducing the heat to almost nothing even in the event of a short circuit.