Got my BB backpack in April and it lasted me all day. The last few days at work it's been beeping at me around 2pm (about 5 hours of intermittent use) to the point I had to finish early on Friday incase the next job couldn't be completed. I know it's a backpack and I don't use it for every single job or all windows, but on the odd day where I have used 3-4 barrels - around 100L) it used to still be going come home time, but Friday it managed maybe 65/70L of water before it was flashing red. Does anyone else have one and what are your battery expectations? Thinking of selling it and buying the new Liteboy whilst WCW still have it on offer and stick a second battery in the van.