I used one of my old chargers... this exact one>>
http://www.rcdocuments.com/Orion_D48_AC-DC_Charger.pdf
and charged up a 300mah battery no problem and it lasted for about 12-15mins I would say...
Maybe I'll have to use this thing to get them going. I just don't remember how long I should charge them for, so I am constantly standing by to make sure they don't get too hot because it never tells you when they are finished.