>

That should at least net you two days or possibly three.
Right now I am using 2x 100max batteries. The life time is really poor - not even a day. Oleds are enabled, rgba is disabled. I am planning on replacing the oleds with nice!view. However I am worried that this will be not enough. Last resort is printing a case with some space for a bigger battery, but maybe you guys have other suggestions? >

If you have the RGBs soldered, and external VCC on, they are drawing roughly 7-8mAh per LED in standby keeping the communication on. 
And as said OLEDs are also a battery killer. With nice!views instead, and no RGB soldered, it’s a whole different story. >

Wow, thanks for the info! I was not aware of that. I guess it's desoldering time :D