Replace my Cygolite Metro 550 batteries or go for new lights?

[Veloo]

"Dilemma".

My Cygolite Metro 550 is no longer holding a charge after about 10 years of reliable service. This is the model you have to send in to get the battery replaced.
Quote from March of this year for new battery is $20 USD each. Shipping back to me would be $15 USD.
I'm guessing at least $20 CAD to ship the two lights I have down south for the replacement.

So let's say about $100 CAD to get new batteries for two 550 lumen lights.

There is a video on how to replace the battery and looks like MEC carries the battery mentioned which would be about $60-ish for two of them. I'd have to go buy some wires, flux, maybe some solder.

So wondering, do I spend on shipping down the lights and let Cygolite do the replacement?
Keeps things kind of convenient since I have the mounts set up on the bikes and also a helmet mount.
Keeps a functional electronic device out of landfill.
550 lumens seems to be sufficient for the commuting that I have been using them for. Some folks in the line of fire have been quite annoyed by the 550 lumens.

Or after 10 years, has light technology come a long way and it's time to let these rest in peace?
More lumens better? 550 is dinosaur lumens now?

I'm very much a DIYer but for the small difference in cost, I'm just not up for a soldering job.