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Originally Posted by Scary Des
Question for any electronics experts on the forum, would it be possible to use a capacitor to trickle charge a small battery  Ideally, what would happen is that a supply would turn on for a moment (5 sec), the capacitor would be able to store sufficient power to slowly charge a battery over a longer period (30 min)  Don’t ask why cos it’s a secret but if it is successful free ones to all that help   Des |
Hardly an expert, though I used to build avionics.
Two problems with your idea: First is leakage. Capacitors all have some inherent leakage. To charge one to a voltage suitable for charging a battery (i.e. about 20% more than the battery's rated voltage) would yield that voltage for a relatively short period of time.
Second is that as you draw off that current, the voltage will drop (giving you the same problem as in the first scenario.)
To overcome those effects, you'd need a really large capacitor array, and a pretty good size power supply to charge them quickly.
You'd probably be better off looking for a longer lasting battery in the first place.
My opinion only;
jky
