I've found an old battery charger amongst a box of junk. On the back it says:

OUTPUT 1.2V 550mAx2

If I'm charging 2000mAh batteries, does that mean it will put 550mA of charge into the batteries per hour, and therefore take about four hours to charge?

My other regular charger (a Fujifilm / Uniross Ultra fast charger) says:

OUTPUT DC6V 1000mA max
Charging current: 1000mA