I've had good luck so far with Ballistic batteries in 2 skis . Been running a 12 cell in Hydrospace and an 8 cell in Superjet . They seem to be well made with a solid case . I keep the terminals coated with Buster .Modified the stock battery box in the Hydro . For the superjet , glued layers of hydr turf into a block with a recess for the battery so the straps stay tight . Thinking about mounting it on the electric box and using some real short battery cables .Ended up installing 14lbs race weight kit between tank and motor to keep the nose down for bouy riding and take the weights out for surf riding .