Bissell Colt Cleaner Battery

I also bought a bizzell colt upright cleaner, and now it doesn't work needs a battery, but I'm unable to find one, in NZ, its not that old, 2or 3 years, should have kept my old one as its still working a friend has it, so now I have to spend more money to get one that's going to see me out ( I am 72 ) so what too buy now??? Not a bloody Biźzell, thats for sure, somewhere I can get help if needed. Robyn W.