The PowerMatch processing takes place completely within your computer; the power meter simply provides an input. For that reason, PowerMatch should not play a factor in your power meter’s battery life.
That being said, it is possible that Bluetooth draws more power than ANT+. If you have an ANT+ USB stick, then you could test this by replacing the BLED112 dongle with an ANT+ dongle to see if it has a noticable effect on battery life.