In this example the new 6v fits exactly in the empty old casing leaving some space at the ends. Connecting wires to the original metal clips makes it quick and simple. Be careful for short circuit while working on it 
. In the battery case everything is held in place by good double sided tape. Strong but possible to take off if needed. Not in the pictures is the top of the battery case put in place.
. In the battery case everything is held in place by good double sided tape. Strong but possible to take off if needed. Not in the pictures is the top of the battery case put in place.
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