Will this effectively charge a portable car battery charger?

It all depends on what ratings on the car battery are. Once you have volts & amps then match with incoming volts & amps on electrical source. Good luck.

ASIN	B087ZWS7CG
Additional Features	Charging Indicator, Short Circuit Protection
Amperage	2 Amps
Brand	GuanTing
Built-In Media	8 x DC Socket Tips
Color	2A
Colour	2A
Compatible Devices	Android Tablets, Webcam, Routers, Toys, Recorder, Bluetooth Speaker, Arduino UNO MEGA, Radio, Security Cameras, CD Player, etc.
Compatible devices	Android Tablets, Webcam, Routers, Toys, Recorder, Bluetooth Speaker, Arduino UNO MEGA, Radio, Security Cameras, CD Player, etc. Compatible devices Android Tablets, Webcam, Routers, Toys, Recorder, Bluetooth Speaker, Arduino UNO MEGA, Radio, Security Cameras, CD Player, etc. See more
Connector Type	DC Barrel Connector
Connector type	DC Barrel Connector
Current Rating	2 Amps
Customer Reviews	4.4 out of 5 stars 1,275 Reviews
Enclosure Material	Acrylonitrile Butadiene Styrene
Frequency Range	50-60Hz
Included components	8 x DC Socket Tips
Input Voltage	9 Volts
Item Weight	0.1 Kilograms
Main Power Connector Type	2 Pin
Manufacturer	GuanTing
Model Number	GT-0902000
Number of Items	1
Number of Power Levels	1
Output Current	2 Amps
Output Voltage	9 Volts
Portable	No
Power Plug	Type A - 2 pin (North American)
Power Source	Corded Electric
Special features	Charging Indicator, Short Circuit Protection
Specification Met	CE, FCC
Unit Count	1.0 Count
Wattage	18 watts

Universal 9V 2A AC Adapter Power Supply AC110V to DC9V Power Controller with 8 DC Plug Adapter Converter Inverter Charger Transformer Adapter AC-DC (DC9V-2A)

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