This is the Ofna Prolux 9-14 Volt 18-Amp Power Supply.  This is enough power for most R/C chargers.

Features:

• AC switching power for high efficiency performance
• Special IC (integrated circuit) for very stable output voltage
• Built-in cooling fan
• Voltage is adjustable from 9-14V
• Banana jack output terminals designed for most R/C modeling chargers
• Power attachment with banana plugs attaches to output terminals and allows chargers with alligator clamps to be used
• Short circuit output protection
• Power-on LED
• Vented anodized aluminum case

Includes: Prolux 9-14 Volt 18 Amp Power Supply with power attachment, 70" (178cm) long AC power cord and instruction sheet

Specifications:
Input: AC 110V-60 Hz          Length: 7.4" (188mm)
Output: DC12V 18A             Width:  4.6" (117mm)
Height: 2.75" (70mm)