K12 Electic supply problem possibly?

Hi,

when i lower/raise both front electric windows at the same time, they work at a slower speed...very slow compared to just raising/lowering one at a time.

when the headlights are on;
if i use the front electric windows, i notice the headlights dim slightly while the windows go up/down
if i switch on the air con, they dim aswell (literally for only a second)

Does anyone know what the problem is? i was thinking it could be the battery, but ignition start up is fine. so it is puzzling me!
...if it is the battery, then please could any1 recommend the best battery for a K12

Thank you for helping!
 
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