I have a lot of rechargeables*, not only the gigging stuff but also I have outdoor wildlife cameras. Over the last month I tested all the batteries I had as I had suspicions on some of them. Doing that I threw away 2 silver duracells (very old), 4 energizers, 1 ikea, and a couple of lidl batteries, again old.
I marked the batteries as to how much charge they had. Anything below 1400 I threw away, 14-1800 marked with brown for internal house things, 18-22 marked with blue, and the 22+ marked with red. most of them are red.
The ones that have surprised me the most are the coloured batteries I bought from lidl, for £5 for 4. I have quite a few of those. as I said I threw 2 away, I have 14 left I think, they are all red. The 3 ikea batteries that are remaining are higher than specified (they say 2480 and two are over 26). My new duracels are all good but I got them a few weeks ago when I threw a lot out. The duracels and the lidls (and ikeas) work a week in the trail camera.
* Just counted 56 AAs, 12 AAAs, but there are probably some I am missing in gigging stuff.