The information contained in this document is generalized information on Lithium-ion (Li-ion) type rechargeable batteries, such as those used in portable power tools.
This information represents "experienced technical opinions" at the time of publishing and is written as general information and helpful advice for the average product user looking to maximize rechargeable Li-ion battery power use and battery life. The information provided is not intended as expert technical statistical data and does not guarantee any item or effect any product warranties.
Memory Effect: Li-ion batteries are not prone to what is referred to as the "memory effect". These batteries do not require complete discharge before re-charging.
Battery Lifetime: The average life of a rechargeable Li-ion battery used in most portable power tools, operating under normal conditions and care, is generally between 300 to 500 charge-discharge cycles. This translates into approximately three years of battery life for the average portable power tool user. Li-ion batteries tend to be lighter, more prone to damage from severe temperature fluctuations, and overall less durable, when compared to similar Nickel-cadmium (NiCad) batteries. This makes them more popular with residential users, who tend to appreciate the weight reduction and not subject their equipment to commercial construction-site types of working conditions.
As the rechargeable battery begins to die, the user will usually notice a decline in the running time of the battery.
Example: When a battery that originally operated the tool for three hours of use is now only supplying the user with one hour worth of use, it's time for a new battery.
Maximizing Battery Performance: There are several steps that can be taken to maximize the life and performance from the rechargeable battery. Below are some of the most common recommended practices to promote a healthy and longer life cycle of Li-ion type batteries.
Break-In New Batteries: New Li-ion batteries generally come in a somewhat discharged condition and must be fully charged before use. It is recommended that new batteries be fully charged to reach its maximum rated capacity.
Keep the Batteries Clean: It's a good idea to periodically clean dirty battery contacts with a cotton swab and alcohol. This helps maintain a good connection between the battery and the device.
Exercise the Battery: Do not leave the battery dormant for long periods of time. We recommend using the battery at least once every three to four weeks. If a battery has not been used for a long period of time, perform the new battery break in procedure described above.
Battery Storage: If you don't plan on using the battery for a month or more, we recommend storing it in a clean, dry, cool place away from extreme heat or cold and away from contact with metal objects. Li-ion batteries will self-discharge during storage, although at a slower self-discharge rate than Nickel-cadmium (NiCad) batteries.
Li-ion Battery Charger: It is important to use only the battery charger that is specifically matched to the battery and approved for use by the battery manufacturer. Most Li-ion battery chargers are durable and if taken care of normally last the full lifetime of the associated tool. However, there are those rare occasions where the battery charger may need to be replaced with a new one. Since most of these style chargers are draw-dependent, internally-regulated and for the most part non-repairable, the testing of these chargers is not something the average consumer or service center can readily do. If the battery charger is not charging a relatively new battery or for some other reason is suspect, such as the charger suddenly feels unusually cold or unusually warm to the touch during charging, replacement of the charger may be necessary.
NOTE: The average life and discharge recharge cycle data are for reference use only. As explained, there are many and various conditions that can positively and/or negatively influence the outcome of a particular battery actual life cycle.
