tempforce

if i use the car every day or every other day.. i turn on the key and the hv battery is around 3/4 charge. i can drive in electric mode for several blocks before the ic engine starts... if the car sits for a few days, i turn the key on, the hv battery is less than 1/4 charge and the ic engine starts up. is it normal for the hv battery to discharge while parked??? thank you.