Certains commentaires sont faux dans votre message…
Une batterie au Lithium ION n’a pas de mémoire.
Il faut toujours garder la abtterie dans un endroit frais ( au frigo ) lorsque celle ci est chargé à 40 % pile et lorsque l’on prévoit ne pas l’utiliser pour une longue période.
Ne jamais vidé complètement la batterie.
Ne jamais vidé la batterie au-delà de 5 % de sa charge. Pour se laisser une marge de naoeuvre, mettre l’alarme de batterie faible du portable à 7 % ( éteindra alors lorsque la batterie aura 7 % de jus à l’intéreiur ).
SI possible, charger la batterie lorsqu’elle est à 20 % de sa charge.
On peut la charger au complet, comme juste lui mettre 20 %. Pas obligé de la charger au complet à chaque fois.
http://www.batteryuniversity.com/parttwo-34.htm
Contrairement à ce que vous disiez :
Some lithium-ion batteries fail due to excessive low discharge. If discharged below 2.5 volts per cell, the internal safety circuit opens and the battery appears dead. A charge with the original charger is no longer possible. Some battery analyzers (Cadex) feature a boost function that reactivates the protection circuit of a failed battery and enables a recharge. However, if the cell voltage has fallen below 1.5V/cell and has remained in that state for a few months, a recharge should be avoided because of safety concerns. To prevent failure, never store the battery fully discharged. Apply some charge before storage, and then charge fully before use.
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 does not cause harm because there is no memory. (In this respect, lithium-ion differs from nickel-based batteries.) Short battery life in a laptop is mainly cause 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 pack down in the equipment does this. 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 a hot car. 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 are concerned 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 prices.
If you have a spare lithium-ion battery, use one to the fullest and keep the other cool by placing it in the refrigerator. Do not freeze the battery. For best results, store the battery at 40% state-of-charge.
Aussi important de lire : http://www.batteryuniversity.com/parttwo.htm