A123's are made by a company called A123, they are a very hardy cell, can be charged at 10C and only come in 2300 and 1100 Mah, lots of rip off copies called PO4's and other names, but genuine A123's are not known to fail unless abused, can be charged on any charger that has a maximum voltage of 3.3volts or designated LiFi.

Mike

EDIT: can manage a current draw of 80amps.