The battery in the above link is not the correct capacity.
Its technical specification are unknown if it is the same or even near cells that ACR utilized.
Its expiration date is not known.
Yes, but you know how it says "special order item, ships in 3-5 days"?
That means they build it before they ship it, the expiration date on cells is usually 5-10 years ... and no reason a higher capacity couldn't be arranged
But even at less capacity,
same argument applies
diy plb is better than no plb at all
Just twisting the wires together will almost insure that the unit will not function when needed as copper corrodes.
Where did you hear that?
Unless you dip it in vinegar ...
Taped and sealed in a box, its not going to tarnish for decades
but they do sell grease for sealing connections