Recently picked up 4 used “AA” battery holders (part #45-39/5312) for my flash units (ProFlash and 45 CL4).
Noticed that some (2 out of the 4) are missing what appears to be a built in capacitor (?)
What is it, (Is it a capacitor?) what is it for, and more importantly which ones should I use or not use for that matter?
Thanks in advance