Where can I find a secondary (not a primary replacement) battery for
my notebook, a Clevo 5600D? It's a P2.4 GHz notebook made by an
Alienware spinoff company. My current battery's voltage is 14.8 volts
DC, with 4000 mAH -- my new battery must match the voltage (exactly),
and preferably exceed the mAH.

I would like 5 options, PREFERABLY from CANADIAN stores, online or
not.

Thanks

Sure go to 

www.batterysavings.com   

They have the best prices on new laptop battery replacements

One option would be to go here:
http://www.shoplaptop.net/power-battery-clevo.html
They have the replacement secondary li-ion battery for the Clevo
5600D.
To me this seems like the best choice to go with. Clevo parts are
pretty difficult to find, and Alienware is even harder. They are the
same laptop however, just different colors. I hope this helps you.

If you can't find what your need ,please visit webstie:
http://www.abatterypack.com
This site is for people seeking a laptop battery of high quality and
at the lowest prices.

Best place hands down: BatteryFuel (www.batteryfuel.com). They are not
in Canada, but they do ship to Canada. Call them for an education on
batteries, prices are good too, and they have a lot of very hard to
find batteries.