Convoy S11 - 26650 lithium ion or IMR?

I don't have any lights that are IMR. Will this light take advantage of an IMR 26650? My understanding is IMR's have less total mah, but can use their power faster.

[h=1]Nitecore IMR 26650 4200mAh 3.7V Unprotected High-Drain 40A Lithium Manganese (LiMn2O4) Flat Top Battery - Retail Card[/h]
I found this at battery junction. Is that a decent battery to power the light? It's actually cheaper then a "regular" 26650 from Nitecore here. [h=1]Nitecore NL2650DW 26650 5000mAh 3.7V Protected Lithium-Ion (Li-ion) Custom Battery for R40 Flashlight[/h]Are their better options that are safe but less expensive? I just want it very bright
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There are four 26650 batteries listed near the bottom of this page:
http://www.mtnelectronics.com/index.php?route=product/product&product_id=979

You might consider this one also:
https://www.orbtronic.com/26650-5200mAh-IMR-Li-ion-battery-orbtronic

There are others too. Just google on 26650 IMR and you will find too many.

Will this light be brighter with an IMR battery?