MacBook Pro battery percentage jumping down and up
I do not know if your CoconutBattery is doing that but the numbers do not make sense at all. 

Can you look under About this Mac -> More Info -> System report -> Power and get the battery numbers from there. 

What you showing here is a old battery, that has already seen over half of its life but it shows only 86 load cycles--- which is not possible/correct.

In your case resetting the SMC might solve the problem.

Here is how to:

Intel-based Macs: Resetting the System Management Controller (SMC)