Basic Auto Battery Charger
Some nerd girl claims to have made a super capacitor that can replace li-ion and lipo batts…. or at least charge them. The voltage will discharge quickly to 0V simply because the capacitor is discharging by means of the multimeter. A battery might drop 10 to 20 percent of its voltage from 90% charged to 20% charged based on technology and discharge rate. If the DC source is removed from the capacitor, the capacitor will retain a voltage across its terminals (it will stay charged).
Some huge capacitors will act like a battery and create some tiny voltage across its terminals. The black band indicated which end of the paper capacitor had some metal foil (which acted as a shield). Commonly, if an AC voltage source is connected to a capacitor, the current will flow by way of the capacitor till the supply is removed. The following diagram shows how …
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