Batterys mah for the Reo Grand

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teasterday i orderd a REO Grand from Reosmods.com. And i am soooo excited to get set up

But i have been searching the forum to find out witch battery to use. I have read that the "best" battery is the AW IMR 3,7V 1600mah but my local batterystore only have the Nitecore Li-Ion 3,7V 2600mah battery in stock....

Would this battery be as good/better though its mah is much more?

Batterys mah for the Reo Grand