I have a lot of portable electronic devices. They have one common feature: they use batteries for power.

Batteries in a Portable World is a comprehensible source about how to choose and maintain batteries. A few facts/tips I’ve got about Lithium-ion (“Li-ion”) batteries:

• Li-ion batteries have a defined age limit. Once the anticipated cycles have been delivered, no method exists to improve the battery. Therefore, avoid purchasing spare Li-ion batteries for later use. Observe manufacturing date when purchasing. Do not buy old stock, even if sold at clearance prices.
• Periodic full discharge is not required because the Li-ion battery has no memory. Avoid repeated deep (80 percent) discharges.
• Partial discharges produce less wear than a full discharge and the capacity loss per cycle is reduced. So, charge the Li-ion often, except before a long storage.
• For best storage, keep the battery cool, but never freeze a battery. In addition, never fully charge or discharge the battery before storage. Most battery manufacturers store Li-ion batteries at 15°C and at 40 percent charge.
• If your laptop is capable of running without a battery and fixed power is used most of the time, remove the battery and store it in a cool place.