23fbaf81_ess___Photographically_Curious__Mirrorless
[Overall] Battery life [SLR] Extremely good: even with a fair amount of rear-display usage it is possible to shoot several days on a single battery charge. Once spare battery is enough for virtually any assignment. [Mirrorless] 
Poor: a full battery charge typically lasts at most one day. For trips away from electric power mirrorless shooters calculate one to two batteries per day.
SLR vs. Mirrorless | Photographically Curious
Mirrorless