Sandisk Solid State Drive Extreme on MBP 13" 2012

Hello,
I recently replaced a Samsung 830 120gb  with a Sandisk Extreme 240 gb drive. I am wondering why I have a significant decrease in battery life. On a Samsung 830 I was able to get 6 hours of battery life, and if not 7. On the Sandisk Extreme however, the battery life decreased to roughly 5 hours of battery life or less. I reinstalled the exact same applications on my Sandisk as on the Samsung. On Newegg it advertises Samsung with 0.12 W (active) and Sandisk with 0.6 W (active). Is there a signifcance in the change in my battery life because of that? Can someone give me insight in this? I need to improve my battery life.
Thank You!

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