In the 3 years iv owned this car (na and tt) it's always had a crap battary. Ie it would be randomly flat if I left it over night and would leak from the top after a long drive.

 

So I replaced it after the tt conversion, the exact same thing is happening again it's only been in for a few months and it's flat again not holding charge and it's leaking from the top...

 

Assuming iv not accidentaly bought another duff battary that just happened to have the same problem I'm assuming there is some sort of voltage regulator? I get the feeling it's over charging? Is it a case of new alternater? Or new regulater? Because obvioulsy iv had the same battary fault with two different engines???

 

I'm so confused I really would appreciate any help regarding this problem.

check the boot light isn't staying on......nvm you don't have any boot trim, obviously you have a drain from somewhere,

There's barely any pull on it when it's off, it's gotta be overcharging somehow...

I think it should be 0.25 or thereabouts on the meter of dark current when all is off.

I had the exact problem on my MX5 until I finally located the 'drain' at the back of the clocks.