Macbook Pro 15 Late 2013 Battery (Books Extension)

[selcukmulazim]

I would like to ask a question about my battery.
I have a MBP 15" late 2013 2,3 GHz Intel Core i7 16 GB 1600 MHz DDR3 RAM.
My Cycle Count is 790, it say good battery status. But sometimes, when I click Battery sign it says Service Battery, and the status changes to Service Battery. And these Service Battery times, my battery drains noticeably fast.
I also noticed that, there is always a "Books extension" in the Battery status bar that is using significant energy.
When I force quit that, battery drains normal.
How can I turn off this Books Extension, should I remove the PDF's from my Books application, my sync option in Books is already closed.
Is there something wrong with my battery?
I attached the screenshot about this "Books Extension"
Many thanks in advance.
Selcuk

 

[lagisibuk]

I would like to ask a question about my battery.
I have a MBP 15" late 2013 2,3 GHz Intel Core i7 16 GB 1600 MHz DDR3 RAM.
My Cycle Count is 790, it say good battery status. But sometimes, when I click Battery sign it says Service Battery, and the status changes to Service Battery. And these Service Battery times, my battery drains noticeably fast.
I also noticed that, there is always a "Books extension" in the Battery status bar that is using significant energy.
When I force quit that, battery drains normal.
How can I turn off this Books Extension, should I remove the PDF's from my Books application, my sync option in Books is already closed.
Is there something wrong with my battery?
I attached the screenshot about this "Books Extension"
Many thanks in advance.
Selcuk

I think this is normal, the battrey is old actually.
but, as long as your machine is normal, dont worry about that.
one think and important, please check your battrey physically, you can open bottom case using right screw and see what happen to your battrey.

if your battrey indicate "swollen", replace is as soon as possible, for safety reason.

this is example of swollen battrey.

Close you Books if you dont need it.