Autonomous power sources are one of the most useful inventions of mankind. The device of many devices, as well as the conditions for their use, do not always provide for a permanent mains power supply, therefore such sources of electricity make it possible to operate in comfort almost anywhere.

There are many different types of batteries, but it can be noted that lead-acid batteries are very popular today, have an optimum ratio of price and quality and provide high reliability of the battery, even in difficult climatic conditions.

Lead-acid batteries differ in the type of electrolyte used:

- batteries using AGM technology,

- batteries with liquid electrolyte,

- Battery technology GEL.