How does the extended life battery (TV08) work? Does it kick in once the primary battery is dead?

I just received my extended life battery. Following the "instructions", I was able to attach it to the bottom of my laptop.
I left it charging overnight.
Today, I unplugged my AC adapter and ran on battery. After a couple of hours, my primary battery completely discharged. I was expecting the extended life battery to "kick-in". It did not. My computer completely shut-down.
My question is, am I missing something on how to use this extended life battery or do I have a defective battery.
My laptop is a Probook 6455b.
Thank you.

ndhoffma wrote:
I have an elitebook 6930p & am trying to use it with the TV08 battery as well. The battery seems to work with the laptop, but makes a buzzing noise when in use (this does not happen with just the TD06 battery or when plugged into the docking station)
I called tech support & they told me the battery (being 14v) would overheat with the laptop. Everything I can find on HP's site says the TV08 would be the correct extended battery for the laptiop.... does anyone know what the issue might be (with the buzzing, or which battery should be used)?
According to your service manual the tv08 (534063-291) is only for use on japan model 6930p elitebooks, chapter 3 page 28.
Click to download your service manual

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