This tread is a summary of how to fix and repair common problems with the Pool blaster battery powered vac. I am a busy guy so please forgive me if I do not post up all the info at once. I went through the process of fixing my vac read some other treads here and here is my summary.
Problem #1A Inferior stock battery
Solution: Replace it with aftermarket battery of greater capacity.
The most common problem is battery failure. This failure will keep the unit from running. If yesterday your vac was working and today it is not chances are its the battery.
The battery failure problem is actually a symptom of a cheap charger. Due to the chemistry of the battery (nickel metal hydrite) the charging of this type of battery is more prone to more failures (over charging) than other chemistries such as Lithium polymer or Nicd. So to charge these batteries right you need a good charger. A good chager is Problem 1b. My solution is to use an RC type of charger. But first things first here is how and where to get a new battery.
Problem 1a Solved First pic is the new battery Second pic is new verse the old for comparison sake.