Battery storage capacity. The Battery storage capacity is the amount of energy the battery can store to power a portable device such as a notebook computer. The lower the storage capacity of a battery, the shorter amount of time it can power a portable device.
Other contributors have said: The average bathtub will hold 40 to 60 gallons when completely filled. A: Get a bucket that you know the size of (normal buckets hold up to 4.5 gallons (18 liters)). Next time you fill the bath, fill it bucket by bucket. Then you will know how much water you have used.
Some hot tubs that fall outside of this weight range. For example, the Swim Spa designed by Spa Manufacturers, Inc., weighs about 2,400 pounds and can hold up to 1,200 gallons of water. Spa Manufacturers also sells a smaller 5-foot by 7-foot spa-style hot tub that weighs 300 pounds when empty and can be filled with 150 gallons of water.