Quote:
Originally Posted by sparrow.2
Did you scuff the ends of the cells a little with sandpaper or a dremel with a soft sanding whell before you soldered them? That usually helps with mine....
Try padding the bottom of the battery brace too. Might help by keeping the cells a little tighter with the padding underneath as well. I use foam sheets in 2mm from craft shops and stick them in with thin double sided tape. (you can colour-coordinate with hte foam as well  ) |
don't scuff the cells.
If you are going to solder, use a small amount of flux on the cell before soldering. Thats how they should be done.
Chances are you have a mixture of a little cell vibration/movement and a slightly cold solder joint (not enough solder flow from the heat). Heatshrink will just compound the problem.
I get a little movement but not a lot, and it is tight around the motor mount. You could try turning the batt strap screws in a little more so the strap really clamps the cells, or put foam on the underside of the strap.