I use Ozzito battery tools and they have this cool little adapter with 2 USB ports on it so you can convert the battery into a power bank. Cheap as chips ($11 from memory). Not sure if the other manufacturers do it.
Edit. Gone up in price I see.
https://www.bunnings.co.nz/ozito-pxc...E&gclsrc=aw.ds
Looks like Makita do them too now.
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