Just a follow -up.. well, it's been over a year and here's the status...
1) the online store (.ca) is gone, they are closed for good.
2) the two batteries (one in my Pre3, the other in my wife's) have hit that battery bloating mark.
My wife's was slightly inflated enough that when charging, it would get hot, inflate just enough to make the cover's contact for the touchstone a problem.
My phone.. the battery's bloat was really bad, but until just lately, my phone was still charging fine on the touchstone. But no longer.
Considering that I tested the two phones' changing schedule, my wife would leave hers to charge more often then being used (the phone is more just a "in-case" when she'd go out) than constant usage.. but lately she's been texting more.
Mine, I'd charge only after a few days once my battery would start getting low (my turning data 3G off does a HUGE difference in power and battery life).
But my battery was the worse, somehow, the opposite from what I expected.
So, right now, my wife's is back on the original battery, and I've put her "made in china" one in my phone.. so far all is fine.
But, I still want to have extra batteries as I really want to use these phones as long as possible.
The Mugen..so many bad reviews, issues with them, and the price that I find a bit much lead me to look elsewhere.
I found a seller on eBay that sells "made in China" ones, similar to the .ca store, for about 20$ each... so I've ordered 3 of them, 2 as replacement, and a spare in case.
I'll return to review them once I receive them.