> On Feb 6, 2016, at 4:21 PM, Mark J. Blair <[email protected]> wrote:
>
> Today I discovered that I hadn't replaced the NiCd battery in time in my
> Amiga 3000. Pictures:
> ...
> While I begin to figure out how I'd like to perform this repair, I'm curious
> about what others have decided to do in similar circumstances. Many options
> come to mind:
>
> * Solder in the same kind of NiCd pack to keep things original.
I haven't yet done this, but I have a device (Fluke 881AB voltmeter) with dead
NiCd batteries, and when I get around to replacing them that's what I was
thinking of. NiCd batteries are still available.
> * Solder in a supercap instead.
That has vastly less capacity, and a very different discharge curve
(exponential vs. nearly flat). Depending on the circuit using it, that might
work slightly (at 10% capacity, maybe) or not really at all.
> * Reconfigure the circuit to use a non-rechargeable lithium coin cell in a
> holder instead. I don't think I've seen one of those leak before.
It hasn't happened to me, but have heard of one case of a leaking Li primary
cell. Not a coin cell, but a C-sized one: I remember a report of one leaking
in an automatic parachute opener (AAD), wrecking the parachute. In fairness,
that was one left in quite a number of years beyond its expiration date.
(Before someone asks the obvious: the problem was found during a required
inspection on the ground.)
paul
