Perhaps you are baffled that anyone would suggest using one battery to charge another. Maybe you were expecting some magic trick that would allow you to add charge to your battery without having to find an alternate source of electric power. In fact, that is not possible. One of the fundamental laws of physics (the law of conservation of energy/conservation of mass) makes clear that you can’t get something for nothing. Deal with it. It is recommended that you charge your battery rather than attempt to hotwire your electronic device and use the alternative batteries directly. Using the improper amount of amperage or voltage can potentially damage complex circuitry, so such methods are obviously not worth the risk.
If you are using AA and AAA batteries; you may want to connect them to each other “in serie” before attaching them to the battery requiring a charge. This means using wire to connect the negative side of all the small batteries to the negative connector on the battery that needs a charge, and the same for the positive side. [2] X Research source
Note: Your battery is not being recharged. Some internet commentators have suggested the rubbing the battery provides it with additional charge, perhaps from built up static electricity. [3] X Research source [4] X Research source This interpretation is entirely incorrect. Lithium ion cells, like all genuine batteries, release electricity as a consequence of chemical reactions. As predicted by the Arrhenius equation, these reactions become more powerful as temperatures increase. [5] X Research source Essentially, you are improving the conductivity of the battery by raising its temperature.
