This guy has a long-winded introduction about downsizing and making things simpler. Go to 3:10 mark to see the part about batteries:
Video includes: simplifying the devices he has in order to get rid of odd batteries sizes, why you should have Eneloop battery adapters , battery storage ideas, why the Amazon Basics AA Rechargeble Batteries are even better than Eneloops & chargers.
Rechargeable Batteries The Dirty Little Secret
https://www.youtube.com/watch?v=myhUaa8C4XQ