Rechargeable: Difference between revisions

New LiFePo4 batteries have about 20% lower energy density than Li-ion, but they become even after about a year of use. LiFePo4 also have much longer life (typically about 10 years, as opposed to 2-3 years for Li-ion) and can endure almost double charge/discharge cycles than Li-ion. They also have lower self-discharge rate, and 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 special charger (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).