China V18 Tool to M18 Battery Adapters

[Auggie]

Has anyone used one of the M18 to V18 Tool battery adapters that are available from numerous Chinese sources on eBay, such as this?

 

18V Battery Adapter for Milwaukee M18 Li-Ion Battery to V18 Battery 18Volt

 

Although I've switched most of my tools to M18, I still like the compactness of my Hatchet Sawzall, which has not been reintroduced in M18 form.  But I'm wary of the quality and durability of these adapters that seem to be only available from China through eBay so I would appreciate all feedback, good and bad, from those who've used these.

 

TIA!