Lithium-Ion (Li-Ion) battery technology is one of the fastest-growing trends in the tool community, and certainly for good reason. Lithium-Ion batteries have the best energy to weight ratio, meaning they pack the most power with the smallest amount of bulk.
They also experience no memory effect or, lazy battery effect. This occurs when a battery can no longer accept a maximum charge for having been repeatedly recharged without being fully used (a common symptom of Nickel Cadmium (NiCad) batteries). You can also buy li-ion batteries by clicking this source: ENGINEERING & DESIGN – NuEnergy Storage Solutions
Li-Ion batteries, conversely, have absolutely no memory and can continually accept a maximum charge. Additionally, they have a very slow rate of charge loss while the battery is disengaged.
General Li-Ion Battery Tips:
On occasion, Lithium-Ion batteries require more than one charge (sometimes 2 to even 10) to accept a full charge. The first time you charge your battery, leave it to charge overnight. This ensures you'll have maximum power for your first use.
To maintain proper balance in your battery, leave it to charge overnight about once per week for the life of the battery.
When buying a new Lithium-Ion battery, make certain you are buying a fresh one. There's a chance a battery has been degrading on the shelves of manufacturers and distributors so be certain you are buying a new one. Most manufacturers provide a date code on the battery or packaging. Check dates before you purchase, and be confident you are getting a fresh, high-performance battery.