Cycle between 4 batteries, or use 2 and keep 2 new?
Okay, I know this is probably my OCD, and this is not a big deal, but i was wondering what's the best thing in this scenario: Let's say I have 4 rechargeable batteries, 2 of them I use in my wireless keyboard and mouse, the other 2 are left in the box brand new. The batteries that are in the keyboard and mouse require recharge every 6 months or so. Now my question is, do I cycle between the 4 batteries so they wear evenly, or just use 2, and keep the other 2 new. What's the best for keeping the battery health good overall?
This is just an example, I do have more rechargeable batteries that I've used few times, and now they are charged and left in the box. I guess my question is, do i keep all of the batteries in the loop, or use few of them and keep the other ones in the box.
Also, from personal view, do you use dedicated batteries for each device that uses rechargeable batteries or do you swap batteries between devices?
Edit: Sorry guys, forgot to mention they are LADDA rechargeable batteries from IKEA, so I think they are Ni-MH. I've heard they are just rebranded Eneloops.