Try to buy batteries when you need them, because lithium ion ages from the moment it leaves the assembly line. However, by following the recommendations below you can get a longer lifetime from the batteries you own. If possible, look for the date stamp on any battery powered item you intend to buy and try get the newest one. Often you will find it. One cycle is fully charging the battery and then fully draining it. Lithium-ion batteries are often rated to last from 300-15,000 full cycles. However, often you don't know which brand/model of battery is in the item you buy. Partial cycles will give you many more cycles before the battery wears out, so when possible do partial discharges and then. Try to keep your batteries cool whenever possible. Don't store a cellphone or other portable lithium battery in a car on a hot day, and keep them cool when not in use (bring your portable tool batteries inside instead of leaving them in an unconditioned shed/garage). Park an electric vehicle in the shade or a reasonable temperature garage when poss. Charge your battery at a slow rate when possible. For a cellphone, use a charger that is rated for about 1/4 of the battery capacity if you can. Avoid quick charging except for rare instances when you absolutely need the most juice as quickly as possible. Charging at 1/2 its capacity per hour is acceptable but chargers that can charge a phone in un. Try not to abuse your battery by pulling as much power as quickly from it as possible. For an EV, flooring the acceleration pedal on a regular basis is not good for the battery. Similarly, power hungry games can drain cellphone batteries quite quickly as well. If your phone gets hot from high power use (and not the sun or high room temperature), it.
