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#Explain the principles #and types of batteries Repair the damaged 18650 batteries to be reused. There are many types of batteries or batteries that are familiar and are sold in the general market, namely 2A batteries (AA), batteries (AAA), both of which have a voltage of 1.5 volts. As for 18650 batteries, they have a voltage of 3.7-4.2 volts. Old or damaged batteries have a method that can be used again. Revive old 18650 batteries to be usable again. There is a method of testing with a battery charger. Battery Chager should study carefully before doing it. Because batteries are chemical substances. It may be dangerous.