Rechargeable: Difference between revisions
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→Lithium Iron Phosphate (LiFePO4) - 3.3V/cell
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===Lithium Iron Phosphate (LiFePO<sub>4</sub>) - 3.3V/cell=== | ===Lithium Iron Phosphate (LiFePO<sub>4</sub>) - 3.3V/cell=== | ||
New LiFePO<sub>4</sub> batteries have about 20% lower energy density than Li-ion, but also have much longer life (typically about 10 years, as opposed to 2-3 years for Li-ion) and can endure almost double the number of charge/discharge cycles of Li-ion. They also have lower self-discharge rate, are able to deliver higher current, and are more resistant to thermal runaway. However, as they are not as popular as Li-ion, they are still somewhat more expensive. Because they can not be charged to 4.2V, they require a | New LiFePO<sub>4</sub> batteries have about 20% lower energy density than Li-ion, but also have much longer life (typically about 10 years, as opposed to 2-3 years for Li-ion) and can endure almost double the number of charge/discharge cycles of Li-ion. They also have lower self-discharge rate, are able to deliver higher current, and are more resistant to thermal runaway. However, as they are not as popular as Li-ion, they are still somewhat more expensive. Because they can not be charged to 4.2V, they require a charger with a LiFePo setting or hobby charger that can be set to 3.6V max. Walmart sells 3.2V AA-sized LiFePO4 cells by Westinghouse for solar lighting (so no charger included). The working voltage is below what most LED's need in direct drive and if a driver has low voltage protection for ICR cells, it could trigger too early with LiFePo cells. | ||
===Lithium Manganese (LiMn<sub>2</sub>O<sub>4</sub>) 3.7V/cell=== | ===Lithium Manganese (LiMn<sub>2</sub>O<sub>4</sub>) 3.7V/cell=== | ||