Battery adapters for Makita, DeWalt, Milwaukee and others explained.

Word of caution: I have not tested all the adapter and it's your responsibility to check and make sure they work and won't damage your tool, this list is only to get you started, please let me know if there's any mistakes in the list. Also make sure you don't drain Lion batteries completely they can get damaged or worst not be recognized by the charger. And lastly batteries can only be charged with their manufacturer chargers, not through the adapters.
Dewalt 20v Battery to tool:
Older Dewalt 18v: extrafudge.com/ref/B016K1UD0E
Makita 18v: extrafudge.com/ref/B07GXKYTL8
Milwaukee: extrafudge.com/ref/B08C2PS5VK
Ryobi: extrafudge.com/ref/B09FPM49LC
Bosch: extrafudge.com/ref/B07WD96NF9
Craftsman C3 19.2v: extrafudge.com/ref/B07M6XMGGG
Craftsman 20v Max: extrafudge.com/ref/B0942VSYYC
Ridgid: extrafudge.com/ref/B09H3BBBZB
Harbor Freight Bauer 20v: extrafudge.com/ref/B09JT4JRXF
B&D or Porter Cable 20v Max: extrafudge.com/ref/B092LVBK18
Hitachi: extrafudge.com/ref/B08MTG73XK
Make a Dewalt battery a USB battery pack: extrafudge.com/ref/B00EYSUK7W
Milwaukee M18 Battery to tool:
Older Nicad Milwaukee tools: extrafudge.com/ref/B07TZW4N2Z
Dewalt: extrafudge.com/ref/B09NVPX1G9
Ryobi: extrafudge.com/ref/B07MF7MNR2
USB charger and power source: extrafudge.com/ref/B08KGFLLK4
Craftsman 20v MAX Battery to tool:
Dewalt 20v: extrafudge.com/ref/B09MLJVRDX
Milwaukee M18: extrafudge.com/ref/B09MLKWPTC
20v Porter Cable, Black and Decker and Stanley batteries(18v Bostitch):
Older Porter Cable 18v: extrafudge.com/ref/B086SKPB4S
older Black & Decker 18v: extrafudge.com/ref/B074V7QWGW
Ryobi: extrafudge.com/ref/B07MF75V1B
Bosch: extrafudge.com/ref/B083Y3TJ3R
Dewalt 20v: extrafudge.com/ref/B09JT29W95
Older Dewalt 18v: extrafudge.com/ref/B07GXL7MJ5
Makita 18v: extrafudge.com/ref/B07W5MLXX8
Craftsman c3 19.2v: extrafudge.com/ref/B07Q5WR7MF
Craftsman v20: extrafudge.com/ref/B0944BVSXS
Makita 18v LXT Battery to tool:
14.4v Makita: extrafudge.com/ref/B0745RSWPZ
Older Makita 18v nicd: extrafudge.com/ref/B097GCT9ML
Dewalt 20V max: extrafudge.com/ref/B07SJBVM93
Milwaukee M18: extrafudge.com/ref/B07STCR6GD
Metabo 18V: extrafudge.com/ref/B09H5R9M34
Black & Decker 20V: extrafudge.com/ref/B09GYNFYT8
Bosch: extrafudge.com/ref/B07WHFQYCS
Ryobi: extrafudge.com/ref/B0953BZKXC
Worx: extrafudge.com/ref/B08BYKC7SF
to USB: extrafudge.com/ref/B0B6ZY3GWZ
Worx 20v Battery to tool:
Older 18v Worx: extrafudge.com/ref/B08BP3QH1T
Bosch 18v Battery to tool:
Makita: extrafudge.com/ref/B08RMVBZSW
Ryobi: extrafudge.com/ref/B094C5X9PD
USB: extrafudge.com/ref/B072JHNJK4
Ridgid 18v battery to tool:
Ryobi: extrafudge.com/ref/B0949QCQYY
Milwaukee M18: extrafudge.com/ref/B09HGRLHLD
DeWalt 20v MAX: extrafudge.com/ref/B09HGM1WPN
USB: extrafudge.com/ref/B01K09TFEC
Hitachi 18v battery to tool:
Ryobi 18v: extrafudge.com/ref/B094CK51JL
These links are amazon affiliate links and I might get a few pennies if you purchase.

[@tungadilla]

description links are very useful thanks. so far I use the dewalt to ryobi and bauer adapters and have had good luck.