MacBook Pro battery health

Battery capacities will fluctuate there should be no cause for worry until you're well below the 80% and 500 cycles.

 

I'd be worrying considering the cycle is 174 and it's sitting well under where it should be

 

Its still fluctuating above 80 so I'm not too worried.
Still OP can take it in to Apple, but unless it says "service battery" in the menubar, Apple won't replace the battery.

 

My MBP 7,1 has been consistently at 77% and I'm around 610 cycles. Is this cause for concern?

Will Apple replace the battery for free if it says service battery? The other day I was getting service battery, but after resetting the SMC I'm back at normal.

Just wondering if it comes up again.

 

It is perfectly normal if your battery health (maximum capacity) is more or less than 100%, even when brand new, or if it fluctuates up or down over time. For further details, read the CHECKING STATUS AND HEALTH section of the following link. This should answer most, if not all, of your battery/charging questions:

Apple Notebook Battery FAQ​

The built-in batteries in the newer Mac unibody notebooks come pre-calibrated and do not require regular calibration like the removable batteries in older Apple notebooks.

Batteries are only covered by warranty or AppleCare if they're determined to be defective. Your battery is designed to retain up to 80% of its health for up to 1000 cycles. Since you're below that, you should take your Mac in and let Apple check it out. Barring any manufacturing defects, since batteries are consumable items, is the users' responsibility to replace them when they have depleted.

The "Service Battery" indicator comes on when the battery health drops below 80%, or when there is a problem with the battery.