I use https://www.amazon.com/dp/B00MXCIK32/ref=cm_sw_r_sms_apa_i_nupiEbJGKBRYP
But it shold worck with iny aa battery
Go with higher capacity AAs. https://www.amazon.com/Panasonic-BK-3HCCA8BA-eneloop-Pre-Charged-Rechargeable/dp/B00MXCIK32
There are a bit higher capacity batteries than that available, but I've never used them, so I won't recommend them.
Those batteries are higher capacity than the Switch Pro controller's. It'll go for a very long time with two of those.