How do I buy a battery driven (i.e. cordless for boat use) product that retains power for longer than a year or two?

[Refueler]

Thanks Refueler,
Very interesting. Curiosity is going to get the better of me I think. I'll seek out some new cells and give it a go. (I need a project - I'm boatless until December!)
Cheers
Bob

Why not ... shame to waste the machine.

I'm actually on the look-out for a handheld vacuum for the boat .....