I am using a simple USB charger for my Eneloop AA batteries near my computer, so I wanted a simple holder of some sort to prevent them from rolling around.

First version: the base clips in place (when the tolerance does not quite fit, apply some glue, power strip or whatever) and gives storage for two AA behind the charger.

Going from there I have mashed up several versions:

• 2 AA behind
• 4 AA on the right side
• 4 AA on the left side
• 4 AA on the left and right side: 8 AA in total
• 4 AA/AAA on the left and right side: 8 AA/AAA in total

Sure thing, Eneloops aren't the cheapest, but I've got several years old ones in my rotation (don't know exactly, but about 40 to 50 in AA/AAA?!) and ALL OF THEM are still perfectly fine!

As an alternative I can say Powerowl batteries have impressed me lately. For their very compelling price point they are delivering fantastically! They are low self-discharge as well. Measuring the AA and AAA variants over 5 cycles gave lower numbers than advertised but still higher than the Eneloop.

Amazon links* of equipment I am powering by AA/Eneloop at my desk:
EBL Smart USB Charger AA/AAA (<10€)
16x AAA Powerowl low self discharge 1000 mAh (measured at ~900):
16x AA Powerowl low self discharge 2800 mAh (measured at ~2200)
8x AA Eneloop
8x AAA Eneloop
Asus Republic of Gamers Strix Carry Mouse
Microsoft Xbox Wireless Controller Phantom Black

*The used links are so-called affiliate ones. When you buy a product using this link, I will receive a small provision. The price itself does not change. Thanks so much for your support :)