Random Electrical Question

[Moonstone2.0]

I am confused and need some help....

I have a solenoid that runs of a 9V battery which is button activated.

I had a Duracell Plus Power and it made the solenoid click from time to time but mainly just a weak noise came from it and it didn't work. At first I thought it was a solenoid problem but then tried an Energizer Ultra + and at first the solenoid didn't work but after a while it started clicking again and now clicks on every push.

I put the Duracell back in and it didn't work. Put the Energizer back in and it did work.

Curious, I checked the voltage of the batteries.

Duracell - 8.64V

Energizer - 8.60V

So how can a battery with lower voltage work better!?

So confused!