How do you figure? His charger should quit before his power supply. Charger's only rated at 200w, power supply at 260w. 4s charging at 2c is only 168w.

Here's another option at less than 1/2 the cost:

http://www.hobbypartz.com/26p-balancecharger-6200.html
http://www.hobbypartz.com/77p-g350-powersupply.html