Don't overcharge the device. Safety circuits take care of this problem but you shouldn't keep it on charger for weeks at a time anyway. Overcharging is just as bad lithium stock as complete discharge.
OLithium Polymer - The latest and greatest being used in cell phones. They have a higher power density than the other types. This allows manufacturers to provide either a thinner or lighter battery, or some combination of both. They can be hard to find. They are available for several Samsung phones. Lithium mines Ontario Polymer batteries do not suffer from the poor memory effect and can be recharged anytime.
Design: The Asus Eee PC T91MT measures at 8.9 x 6.5 x 1 inches and weighs just 2.1 pounds. It has an all-white glossy white finish that is only contrasted with a black screen bezel (frame). The touch pad area is gray/silver in color. Overall, this little tablet netbook has a very chic and fashionable appearance, perfect for any style conscious PC users.
Li-ion Batteries last longer and charge quickly. A Li-ion Lithium battery stocks and a quick charger make it possible to work all day with a cordless drill without stopping.
The battery will re-charge a little if placed on a hot surface, like a radiator. Never place a mobile phone battery on a hot surface! There is a significant chance of explosion with extreme heat. A modern Lithium battery becomes less efficient the warmer it gets.
The odds that you will using the Lithium-Ion batteries are 99% ( that's if you are using the new breeds of laptops :) ). Just check the abbreviation that says LION or Li-Ion on your laptop battery label. There are still a few laptops that are using Ni-MH batteries these days and you might want to check with the manufacturer whether you can do an upgrade from Ni-MH to Li-Ion. Using unapproved batteries could led to dire consequences .... so do be very careful on this. If you have a higher budget you might want to check out SMART batteries. It has a power management circuitry and it will indicate to the user what is the current condition of the battery.