Battery Issues, Retina 2013

you can save a lot of battery on low brightness , but as you are already doing that try to force quit all the programs .

and by keeping the wifi off while not using it ,

you can also turn off the notification permanently that will also help

here are few tips for increasing durability of battery

• whenever you shut down the device make sure it has at least 50-60% energy .
• if any mobile or other thing is connected with the device and is charging from it , make sure your device is plugged in.
• lets say , at the sta rt of your day charge your device 100% and then do not recharge untill 30-40% is left
• never let your device run out of power completely , that damages longitivtiy of the battery.

i hope this would help you, please share your device model number and information for better analysis .

Reset the SMC and NVRAM:

https://support.apple.com/en-us/HT201295

https://support.apple.com/en-us/HT204063

Open System Information>Power and post this fro your MBP:

(make certain that the charger is connected)

Ciao.

as you upgraded to 10.10.4 i think some system settings are draining out the power . make sure you go through with the updates settings also.

Nothing out of the ordinary in the System Information>Power display to report.

I have always viewed the 'time left' for the battery run time with suspicion. My suggestion is to record the start time and charge level at the begining of a long session, and when finished, record the end time and charge level. Then do the math. That in my opinion will give a reasonable estimate of expected battery run time. I acknowledge that there are many variables that may or may not be taken into account that have an affect on the result.

Here is a list of Apple support articles that you may find useful:

https://www.apple.com/support/macbookpro/batteries_power/

Ciao.