Carlos
Do you need to use the battery to start the car or can you plug in a slave?
If you can use a slave then go for the smallest red top 8 (7AH). The ignition and pump will use very little in 3 miles.
If you need it to start the car then you will need something a bit bigger say 15 (14AH) at about 5kg - about 70 or £80 from Raceparts, Wallingford.
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