His all need to get a battery for my rebuild, can I ask the dimensions of the battery and also the power etc required for a standard 1275 stage one engine.
Many thanks peeps 
The standard battery fitted to most mini's is a type 038 or 015 (same battery) 12v 38 amp battery 270CCA car battery which is 245mm long x 135mm deep x 200mm high, with the terminals closest to you positive is on the left side.
The battery tray in most minis has space for a larger battery i personaly use a type 090, 065 or 075 (same size batteries just normaly labeled differently) 12v 55-60ah 480CCA-600CCA power ratings vary depending on brands, which is 240mm long x 175mm deep x 175mm high positive on the right hand side with the terminals closest to you (the wires on my 3 mini's are long enough to fit so shouldnt be a problem). this battery is a tight fit and it would be helpful if you got one with a handel attached.
The 090 is a bigger more powerful battery and probably overkill but it fits snugly and if you have added extras it would be better.
To give an idea on price at my work (The Battery Shop www.thebatteryshop.co.uk

) we sell 090's at £46.00 2 year warranty or £51.87 3 year warranty and an 038 is £36.99 with 3 year warranty. Unfortunatly we can not ship them, they are only available for local collection, we are in swindon, wiltshire.
I woulnt recommend buying one from halfords as they are normaly twice the price, its worth shopping around localy.
Hope this helps