Snowdancer wrote:Securing batteries is important. My buddies were loose and the bottom of battery cracked.
I haven't checked how speed boats are secured but think a rubber pad for shock absorption is not a bad idea too.
Even though the internal plates and outer plastic housing tend to be thicker on marine batteries compared to lets say an automotive battery
they still aren't impervious to vibration. So yes, anything that can be done to reduce vibration can only benefit. Obviously the closer they
are to the stern will reduce bounce.
Where I installed mine

(pair of group 24) was a challenge because of the hull curvature. I suppose one could devise any number of
ways using a rubber shock mount fitted to the battery tray. The right amount of cushion is just as important keeping everything rigid as too much could
defeat the whole purpose.
Following cut n' pasted from the web...the part about millions of dollars needlessly spent might be an exaggeration. Bottom line is to use a marine
battery that are designed specifically to meet the needs of a modern boat.
Independent industry studies prove that the most common cause for battery failure is vibration and mechanical shock. Each year millions of dollars are needlessly spent on replacement batteries because consumers unwittingly mount their batteries on hard surfaces that do not absorb the jarring effects of daily use, often leading to sudden and premature failure of the battery. Vibration causes active plate material to loosen and fall to the bottom of the battery case and can break inter-cell welds and grids. Loss of material decreases the life of the battery and could also cause shorts.
Simply put, battery life is cut far short simply by vibration and mechanical shock.
Durability: Some battery designs are simply more durable than others are. They are more forgiving in abusive conditions, i.e.; they are less susceptible to vibration and shock damage