On: Linksys WRT54G and WRT54GS power supply (2005)

[Scoundreller]

Which could be user upgradeable with a snip and a soldering iron.

It’s just a smoothening capacitor, so higher voltage rating is the critical part and can probably get away with non-exact muF capacity.

Possibly removable if you have a lead acid or lithium-ion battery capable of providing lots of current when needed and cleanly.