Cordless drills provide many benefits over normal drills. There is no need for that big pile of mangled wires in the back of your truck. They are flexible, portable, and are the new industry standard. They used to be very expensive, but today everything is wireless so it is a must if you are a carpenter or handyman.
These large battery packs take up a lot of room and are pretty heavy, which adversely affects the fuel economy and the storage space in most hybrid cars. These batteries get their power from regenerative braking and/or from the gas engine. Also, they are very expensive, costing thousands of dollars to replace. Which is why they are guaranteed for the life of the car (read you warranty, some states make automakers guarantee the battery for 100,000 miles).
Use lithium ion stocks the battery. Li-Ion safety circuits do a lot of great things to keep it in good condition, but they're going to go south if you don't use them. There is no wonder they're stored charged to half-capacity. If you most often use your netbook using AC power while you're at home, make sure that you let it run to the point where windows gives critical battery level warning at least two or three times a week.
Much of the response to the threat of Giardia is overkill. A favorite scholarly article on Giardia was written by Robert L. Rockwell, PhD. It's titled, Giardia Lamblia and Giardiasis, With Particular Attention to the Sierra Nevada. Bob Rockwell is an active mountaineer who made his first trip into the Sierra Nevada in 1952 to climb Mt. Whitney, and he repeats this climb several times annually. He has a bachelor's degree in Physics from UC-Berkeley, and a PhD in Aeronautical and Astronautical Engineering (Biomechanics) from Stanford.
The Lithium battery stocks-ion battery is light years ahead of the earlier batteries and considerably better than the Nickel-cadmium (Ni-Cd) or the nickel-metal hydride (Ni-MH) batteries which are still being used. These batteries are less expensive but the Li-ion batteries are far superior in three ways.
External effects can be a radiator in your room or direct sunlight, or just simply a mind boggling ambient temperature. A Lithium mines Ontario-ion cell loses 20% of its maximum capacity in one year when it's stored on 40 degrees Celsius and full charge. Not too many people have 40 C in their room all year long, but what about internal heat sources? If you use your notebook from AC power, you're keeping it fully charged, which it doesn't fancy, and on about 40C.
The long wires of the LED are taped to the negative and positive sides of the coin battery (+) and (-). Carefully twist the wires, ensuring they won't touch each other, into a right angled position which will enable to the battery to rest flat against the inside cover of a glass jar. Tape the battery in place and screw on the jar.
For jobs where the batteries are required to be light weight as well as being reusable, then lithium batteries are ideal. But if a battery is needed to be very reliable or to remain unused for a long time then they might not be the right batteries for it.