Agreed,

My wife's watch battery failed after 2 years. Thought I'd be clever by
buying a set of 12 batteries on eBay for the same price as a branded one.

The generics lasted a month each.

Gave up after I had replaced 3 and just bought a proper branded battery
(Maxcell in this case) still going strong 1 year later.

Cheers,

Nigel