I have been dithering over buying battery-powered garden tools for some time, but recently discovered that it is now possible to get converters between quite a few battery types for around the £30 mark, which means you don't need to commit to a single manufacturer's battery "ecosystem" (though the converters don't necessarily work for charging, so the appropriate charger may be required). Makes me much happier because within reason it means I can buy the tools that have good reviews and still be able to swap batteries around rather than having to commit to one brand that may sell (say) a good hedgetrimmer, but a poor strimmer.
(And I see no reason why the converters wouldn't work with the Instant Vap either.)
James