I have a Black & Decker PowerSwap mower I bought perhaps 7 years ago. Its a battery-operated model that came with 2 60V "Max" batteries (it only needs 1 to operate).
It otherwise still works great, but this summer one of the batteries died (won't take a charge anymore), and at the end of the summer the other one went too.
I tried pricing replacement 60V Black & Decker batteries, but they are north of $200 each. The mower itself can be had for $400. I tried ordering a cheap 3rd party replacement for more like $100, but it never arrived.
So at first now I'm thinking new mower. But then I notice that a lot of battery-operated mowers these days don't come with batteries, but let you pick up your choice from their manufacturer line of batteries, presumably trading off capacity for cost.
So I'm wondering if this is a thing for this old mower too. Can other Black & Decker batteries be used in Black & Decker mowers like this one? Or should one expect that batteries have to match the Voltage and Amperage of the original batteries when buying replacements?