A battery is a combination of one or more electrochemical cells, used to convert stored chemical energy into electrical energy. A battery may be ‘used once and useless’ which is useful for one time using, or rechargeable , these batteries stand for years and supply power again and again. A battery is an electric storage device, which can be available in any number of shapes, sizes, voltages and power.

A battery is simply a collection where a number of cells are linked together with a given voltage and capacity. Power and voltage of the battery are used according to the tools. Batteries are used for saving electric power consumption. The batteries for power tools can be connected in series to get required voltage and connected in parallel to achieve required power. For achieving both voltage and power, a number of series of batteries may be connected in parallel with each other. This pattern achieves both a higher voltage and power for a larger tool. Batteries are classified into two categories, primary battery and secondary battery.

A power tool is a tool powered by an electric motor and by the batteries. Power tools are portable tools, where portable means handheld. These tools are used in industry, in construction, and something like in house for cutting, drilling, heating, grinding, and polishing. Batteries for power tools are specifically designed for each power tool, brand and model. Hand- held power tools have become an essential part of the modern life and contractor’s toolbox. The great advantage of the power tools is the mobility as mobility of the power tools is only dependant on the power of battery. The user can use the power tools as a cordless machine, because the internal battery gives power to the tools, so that there is no need of any cord. The power tools batteries only depend on the power consumption of the tools.

Battery weight has been the greatest challenge, and the greatest opportunity for improvement. The size and weight of batteries is small for the power tools. If the weight of the batteries is high then the mobility of the power tool will not easy. The running time of a power tool is the amount of work a tool can do, from one charge. If a battery reaches the end of its service life then the user can notice the battery back up or the working time of the power tool. By this notification, the user is able to know battery time for future. The user can locate weak cells and faulty inter cell connections also.

The advices of the experts are available on the internet for getting best batteries for power tools. So the user can take a good advice on the types of batteries from the Internet. There are certain benefits which are associated with the use of battery. Batteries of power tools reduce noise pollution as well as air pollution. Cordless battery-powered tools are also easier to use because they are lightweight.