Loading 9 volt battery holders
#1 Sitting side by side the Duracell is a bit shorter than the Sunbeam.
On closer inspection the terminals are not the same either.
No wonder people have problems installing them in the holders.
Note: Sunbeam is a brand found at the Dollar Store and lasts about the same as name brands.
#2 The AA batteries differed too. The two on the left are rechargables which appear to be shorter than the Duracell or Kirkland. Sunbeam is shorter too.
But with these batteries there is a spring on the negative end that can allow a variance in length.
The tops of them all are somewhat different too.
Shown here is the positive end of all of the AA batteries.