The specific battery that I charged was 3.2 V 700mah battery used in one of toys at home.
SkyRC imax b6ac V2 charger - This is a big charger used by RC enthusiasts that can charge a variety of batteries. I charge LiPo and lead acid batteries as well.
Set to LiFe to single cell - 1S. The voltage should be around 3.3.
Set the current to less than or equal to 700mah/1000 = .7 A (Battery capacity in Milli AH (mah)/1000)
Press start
Use a buck boost converter - This is a cheaper option. For around $15, this allows you to set the voltage and current similar to step above