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How to change the battery on a Triumph Bonneville T120.

Model: Triumph T120
Part: Battery

Video tutorial

Let's see how to change the battery on a Triumph T120: first, we need to remove the seat, which is quite simple. We insert the key into the lock located on the seat and take it off, very easy.

Below, we find the battery and we will start by removing the black negative terminal, then the positive one. Here there are some extra wires because the battery was connected to a trickle charger. We remove all the wires and extract the battery using the handle.

Let's replace it with the new one by reconnecting the terminals, first the red positive one and lastly the black negative one, then we can put the seat back in place.


Posted on 29 January 2026 by ScegliAuto


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Watch the video!


by ScegliAuto

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