ok. My car came to me with a 41 ah , 360 CCA, Bosch battery in it. On investigation this is meant for a 1.1 clio...
But the custom fibreglass, rubber trimmed box will only fit this size of battery as a maximum. Leading me to think that Dax (who manufactured the car *kit car) intended this size battery.


I'm just getting it back on the road, and when I took it off in October the battery would run flat if I had headlights on.... and sometimes it went flat over a period of a weeks normal driving.
The guy who I bought it off had had loads of problems with the battery flattening and ended up leaving it on trickle charge. It was a 6 moth old battery on it when I got it.

So I tested it for current drain, and the readings were fine (cant remember them but read up on it at the time)
Charging voltage is fine , about 14volts with everything on iirc.

Now the new engine needs a 62ah battery (2 litre zt), the current 1.8 Zt still needs about this I think.

I know a lot of the power is for ancilleries and stuff, but the only thing my car doesn't have that I can think that a mondeo may have is air con.
It also has more gauges and a bigger fuel pump.

Could the low Ah be the cause of my problems? Its a bit of a PITA fitting a bigger battery as Im going to have to make a custom battery box so wanted to get some thoughts before I do it.

Im 99% sure its going to have to be done though.
Are there any other tests that will prove this?