Just had the car running outside for 5 minutes now with a multimeter on the battery, it started off on something like 12.30 volts, and slowly counted down to just under 12, around 11.95 volts in the end when i knocked it off. then after that it hasnt got enough beans to turn the starter motor again

** i havent really got any tidy photos of the ka sorry. will get some sorted when its back on the road and all cleaned up.