Thanks Aaronng
The battery im using now is a standard sized battery made by Marshall (probably Exide) with 480 CCA. Its about 2 years old.
I did some measurement just now and the battery is 12.71 V turned off and 14.32 V when the car is turned on. Its takes about 3 cranks from cold today to start it.
The idle slump (I didn't see the rpm but I'm sure I heard it straight after the lock went up) went for a short period of time (fraction of a second or so) but thought its strange as the power consumed like what you mentioned is low. Maybe one of my door actuators is on its way.