How to prolong lithium-based batteries

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Simple Guidelines

* Avoid frequent full discharges because this puts additional strain on the battery. Several partial discharges with frequent recharges are better for lithium-ion than one deep-one.

Recharging a partially charged lithium-ion battery does not cause harm because there is no memory effect (in this respect, lithium-ion differs from nickel-based batteries).  Short battery life in a laptop is mainly caused by heat rather than charge / discharge patterns.

* Batteries with fuel gauge (laptops) should be calibrated by applying a deliberate full discharge once every 30 charges. Running the battery pack down in the device would do. If ignored, the fuel gauge will become increasingly less accurate and in some cases cut off the device prematurely.

* Keep the lithium-ion battery cool. Avoid keeping it in a hot car cabin. For prolonged storage, keep the battery at a 40% charge level.

* Consider removing the battery from a laptop when running on fixed power. Some laptop manufacturers also concern about dust and moisture accumulating inside the battery casing.

* Avoid purchasing spare lithium-ion batteries for later use. Observe manufacturing dates. Do not buy old stock, even if sold at clearance price.

* If you have a spare lithium-ion battery, use one to the fullest and keep the other one cool by placing it in the refrigerator. Do not freeze the battery. For best results, store the battery at 40% state-of-charge.
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