[time-nuts] Motorola Oncore UT+ firmware upgrade & backup power questions
artgodwin at gmail.com
Mon Mar 16 04:34:13 EDT 2015
Seiko and some other manufacturers used Supercaps for a while in their
Kinetic watches. Electrically they're fine, but they turned out to have a
shorter life than rechargeable batteries. They even replaced capacitors
with lithium rechargeables when servicing the older models.
In a backup situation they might do better : I believe the problems were
caused by allowing them to discharge and exposing them to high
temperatures, neither of which should occur in a timenut application (as
long as they're not inside a stabilisation oven). However, don't think of
them as a complete solution to ageing nicads - they're still a wet
electrolytic and probably have a finer internal structure than a nicad, so
are still subject to chemical ageing.
On Mon, Mar 16, 2015 at 3:51 AM, Hal Murray <hmurray at megapathdsl.net> wrote:
> csteinmetz at yandex.com said:
> > The Energizer AA and AAA lithium primary batteries (Li/FeS2) have a
> > life exceeding 10 years,
> Like many things, it's temperature dependent.
> A classic trick is to store batteries in your freezer. Aside from better
> shelf life, you can probably find them in the dark.
> These are my opinions. I hate spam.
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