Will 18 volt battery work in 20 volt tool?

As long as it is the new slide on type battery an 18v xr battery will fit i have actualy worked with one on a 20 v drywall gun and a 20 v impact drill no problem

Does the trigger lock so you can run it automatically?

Yes it does, when using the bigger 5.0 and 4.0 batteries we do lock it back, if on the small batteries we don't so much, but good life on the bigger ones, at least half a day if you release the trigger when not using it.

Manufacturer	Dewalt
Part Number	DCF620B
Product Dimensions	20.96 x 7.62 x 28.27 cm; 1.02 kg
Batteries	1 Lithium Ion batteries required.
Item model number	DCF620B
Colour	Yellow/Black
Style	ScrewGun
Material	Metal, Plastic
Power Source	Battery Powered
Voltage	20 Volts
Item Package Quantity	1
Speed	4400 RPM
Measurement System	Metric
Included Components	DEWALT DCF620B 20-volt MAX XR Li-Ion Brushless Drywall ScrewGun Baretool
Batteries included?	No
Batteries Required?	Yes
Battery Cell Type	Lithium-Nickel Manganese Cobalt (NMC)
Item Weight	1.02 kg

DEWALT 20V MAX XR Drywall Screw Gun, Cordless, 4,400 RPM, LED Light, Bare Tool Only (DCF620B)

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