3 ms·
According to the specs, the supercaps may also fail within 10 to 20 years due to lifetime issues. They do not last forever and have a significantly lower lifet
by beeforpork 6y ago
According to the specs, the supercaps may also fail within 10 to 20 years due to lifetime issues. They do not last forever and have a significantly lower lifetime than normal caps.
I've actually opted for batteries for very small currents (µA range) because the battery lifetime is about the same as supercap lifetime, so why bother with a charging circuit?
Two batteries would be nice. Or a battery plus a (normal) cap backup that lasts a week or so (or at least the time it takes to change the battery).
- MertsA 6y agoI had a phone system for a small office fail a few years back. We called a service company out and one of the first things he checked was a supercapacitor on one of the processing cards in the system that keeps some volatile memory stored through a power outage. Sure enough it had failed and in a few minutes he had it desoldered and replaced with a new supercap, he already had plenty on hand in the truck. I figured at the very least they would have swapped the card as a whole and maybe refurbish the failed one later on but due to the common failure of that supercapacitor they just always replaced it onsite. If that phone system had been designed to maintain that memory with a lithium primary battery instead it could have even been a user serviceable component.