jointtech:
these motors are on powerwheels and this battery doesnt look that much bigger than the batteries that come with it and only last 30 minutes.
Looks to me like those batteries are nearly 8 times as large, and 6 times the weight. (double one dimension, and you are twice the size, two dimensions and you are 4 times the size, double all three dimensions and you are 8 times as large). Add to that the fact that flooded lead acid batteries have better energy density (at the expense of higher upkeep/maintenance), and it's no real surprise to me that it has 10 times the energy capacity.