On a commercial job today and pumped water on a ionic 100 psi for 2 and half hours. The pump was set at quarter speed which I normally set at for most jobs. ( I think if a control unit was fitted it would be on 2/3 ) went to move the van and the battery was almost flat, so slow to turn over. The pump was warm to touch but not hot. I've heard that when your pump starts to age and get hot, it draws more power from your battery. Battery is less than two years old and the pump is nearly 5 years. I don't use a leisure battery, it's straight off the van battery as is the fill solenoid. Thanks Steve