What is the Difference Between T1 & T3 Battery Terminals?

8 October 2019 | Tom

So what's the difference between a T1 car battery terminal and a T3 terminal.

The simple answer is the T1 terminal post is wider.

The standard European car battery is known as a T1 or DIN type terminal and is common on most UK vehicles - it is a tapered terminal, wider at the base - the positive measuring 19.5mm and the negative 17.9mm in diameter (this is stop any risk of reversing the connectors and fitting incorrectly).

Some Japanese vehicles, particularly imports, have the narrower T3 or JIS type terminal; again the positive is wider then the negative to prevent incorrect fitting - the positive is 14.7mm in diameter and the negative is 13.1mm.

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