Numerous individuals have a useful multimeter in their toolbox. By connecting the two tests to either finish of a battery the rest of the voltage can be shown. Be that as it may, as mentioned prior in this article, without giving a heartbeat load test, this can be an incorrect strategy.
Hypothetically, if you drop a standard battery, for example, "An" or "C" size, negative-side down, it will skip if it is vacant. This is because of gases which stay inside. Full batteries won't skip.
Notwithstanding, this possibly truly works if you have two batteries to look at next to each other, one which is totally dead while the other is completely charged. Also, this is of no use for square 9-volt batteries or CR2 types.
At long last, never at any point check the nature of your cell phone battery by dropping your iPhone onto the floor. That would be reckless.
Unless you have an incredibly long and strangely adaptable tongue, this test can just be performed on the two terminals of a 9-volt battery. By applying these contacts on the tongue's surface, a circuit is made, giving you a little stun.
Right off the bat, this possibly lets you know if there is any charge remaining, not how much. Furthermore, it's somewhat senseless. Giving yourself a stun isn't the best thought on the planet. Besides, okay lick within your remote control? Obviously not, it's nauseating. But, that is the place the battery sits.
Truly, however, don't put batteries anyplace close to your mouth. First of all, they contain corrosive, and you don't need any spillage on your tongue.
Also, OK, the odds of swallowing a 9-volt battery are little—but if you attempt it with a CR2 then you are asking for inconvenience. Ingesting batteries can be lethal. Consequently, the main protected and precise approach to test batteries is to use a specific battery tester.