All batteries produce low volts, sometimes a little more or less, depending on the type of battery and the chemicals it uses. To make batteries with higher voltages, manufacturers link identical batteries in a series circuit. In this way the voltages of the individual batteries are added together . You can use the same electrical technique to create your own battery packs at home. Doing so requires basic math and no electronic skills.
One of the best places to get batteries that are no longer used but have large capacity and large power output is laptop batteries, these batteries are usually li-ion as they are the lightest per power output and are good in general.
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Video “How to make 12v Lithium ion Battery” Author: S. Kumar