A supercapacitor can be charged much faster than a battery but because of the low resistance of the cap, some sort of voltage and current limiting device is needed to prevent the power supply from overheating. A charge controller or correct value resistors should be used for this purpose.
In this instance, I'm using the Charger Doctor (which shows the current drawn), a voltage boost converter and a diy charge controller and 2 one ohm 1 watt resistors to control the charging of a 2.7v 100F supercapacitor from a 2 amp usb power supply.
While this is a little cumbersome but it is probably better than just using resistors and manually disconnecting the power source when the voltage is reached. As I understand it, the biggest concern in charging is correct polarity. Failure to observe polarity can cause the capacitor to explode. As always, do this at your own risk.
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