What is the best type of rechargable batteries?

Answer 1

If you're talking about battery sizes like AAA, AA, C, D and 9V, Ni-MH (Nickel-Metal Hydride) is the most common one, and as far as I know the only type in these sizes other than the now obsolete Ni-Cd (Nickel-Cadmium). Li-ion (Lithium ion) batteries have also been introduced in these sizes, but they have a significantly higher voltage and thus are not usable on regular battery-powered devices out of the box.

The highest capacities for Ni-MH based batteries are something like this:

AAA 1000 mAh

AA 2900 mAh

C 5000 mAh

D 8000 mAh

There are also newly-developed Ni-MH batteries with low self-discharge (LSD) like Panasonic Infinium and Sanyo Eneloop. These kind of batteries are particularly suitable for low consumption devices like clocks and remote controls, but they're also good for devices drawing high currents such as digital cameras. They apparently used to have a lower capacity than ordinary Ni-MH batteries, but currently the two types are pretty much on par. The LSD batteries can be marketed as "pre-charged" or "ready-to-use".

Answer 2

The one that is right for the application it is being used in. I can't be more specific because there are too many engineering variables, both in the battery designs and applications. Often the best battery doesn't even exist and something else that is available is used while new better batteries are developed.

Answer 3

There are many different types of batteries available in the market based on the needs, the main types include Alkaline,Carbon Zinc,Lithium Cells,Silver Oxide cells,Zinc air cells to name a few. Unfortunately there is no single battery technology available in the market which is ''The Solution'' for all classes of portable battery operated devices.