Does this adapter drain the battery while it's sitting on the shelf? I read in some reviews that it can drain the battery.

Li-ion batteries have a circuit board (called a PCM) which monitors the voltage of each cell while charging, discharging, or just sitting. If the voltage in any cell goes too low or too high the PCM will not allow charging. The PCM needs a small amount of current to do this job (often this current is pulled from 1 cell but that doesn't really matter). Therefore the battery can potentially become "bricked" if the battery sits on the shelf too long. I try to always fully charge these batteries before placing them into storage and if stored long term recharge every 6 months or so to avoid the battery going to "sleep".

Does this adapter reduce the voltage going into the drill ?

The working voltage of both the 18v and the 20v battery is 18 volts under load and 20 volts while not under load. Both batteries are essentially the same voltage under both conditions.

Does with work with the larger batteries even though description says compact batteries only?

When I read this specific limitation, "Do not use adapter with premium batteries (DCB200, DCB204, DCB204BT, DCB205) in 18V Compact drills DC970, DC759." it is written in a way that you should not use premium batteries with the two compact drills mention (DC970 & DC759). I have used this adapter with 2 AH, 3 AH, and 5 AH batteries. Each different size battery provides power to the tool and does not appear to affect the function. It is worth mentioning that I do not own the two compact drills noted above. Also, the adapter will have issues with the 18v circular saw. Even with the slimmest 2 AH battery pack, the circular saw will not be able to cut at its full depth due to the battery pack making contact with the surface of the wood. This will only affect you if you plan to make cuts longer than the base (shoe) of the circular saw at full depth.

Will these batteries & adapter work with my dw959 drill and dw936 circular saw?

As long as it takes Ni cad batteries it will work. The only down fall of this adapter is that u can't leave your batteries plugged on the tool. Someone in the adapter drains the lithium batteries. Other than that it's a good product

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DEWALT20V MAX Battery Adapter Kit, 18V to 20V, 2 Batteries and Charger Included (DCA2203C)

DEWALT20V MAX Battery Adapter Kit, 18V to 20V, 2 Batteries and Charger Included (DCA2203C)

Product ID: 26217766

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Details

Brand
DEWALT
Color
Black Yellow
Output Voltage
2E+1 Volts
Specification Met
UL CE FCC
Input Voltage
2E+1 Volts

⚡18V to 20V MAX Adapter compatibility boost

🔋2x 20V MAX XR Lithium Ion Batteries (2.0Ah)

🔌12V/20V MAX Charger included for instant power

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Description

🔧 Power up your 18V tools with 20V MAX performance—because your work deserves the best!

COMPACT PORTABLE - Lightweight 3.32 lbs kit with sleek design fits perfectly in your professional gear bag.
TRUSTED DURABILITY - Backed by DEWALT’s 3-year limited warranty and certified for safety (UL, CE, FCC).
SMART COMPATIBILITY - Designed for most DEWALT 18V tools—maximize your existing toolkit without buying new tools.
READY OUT OF THE BOX - Includes two high-performance 20V MAX XR batteries and a versatile charger to keep you working nonstop.
POWER UPGRADE ON DEMAND - Seamlessly adapt your 18V tools to 20V MAX batteries for enhanced runtime and power.

The DEWALT 20V MAX Battery Adapter Kit (DCA2203C) transforms most 18V DEWALT tools to run on powerful 20V MAX XR Lithium Ion batteries, delivering longer runtime and improved efficiency. The kit includes two 2.0Ah batteries, a 12V/20V MAX charger, and an 18V to 20V adapter, enabling immediate upgrade compatibility. Ideal for professionals seeking to future-proof their tool arsenal with trusted DEWALT durability and a 3-year warranty.

Specifications

Manufacturer	DEWALT
Part Number	DCA2203C
Item Weight	3.32 pounds
Product Dimensions	13 x 4 x 12.5 inches
Item model number	DCA2203C
Batteries	2 Lithium Ion batteries required. (included)
Is Discontinued By Manufacturer	No
Size	20V
Color	Black, Yellow
Style	Battery Adapter Kit
Finish	Brushed
Material	Blend
Pattern	Kit
Shape	Rectangular
Power Source	Corded Electric
Voltage	20 Volts
Item Package Quantity	1
Head Style	Flat
Measurement System	Metric
Certification	UL, CE, FCC
Included Components	(1) 18V - 20V MAX* Adapter, (2) DCB203 20V MAX* XR Lithium Ion Batteries (2.0Ah), (1) 12V/20V MAX* Charger
Batteries Included?	Yes
Batteries Required?	Yes
Battery Cell Type	Lithium Ion
Description Pile	20V MAX* Lithium Ion
Warranty Description	3 year limited warranty

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