How long to fully charge NiMH batteries?

The charging current is typical for a budget priced (cheap) slow "overnight" type charger. I'd expect it to take anywhere from 12 to 20 hours to completely charge a NiMH cell. You need to know the mAH capacity of the battery to do the calculation. Divide the capacity by the charge rate and add about 20% to figure the maximun charge time for a completely depleted cell.

There's lots of good information about the care and use of NiMH batteries in the link below.

Don

Nimh Batteries

All I saw from the link was a catalog of many batteries and chargers. But basically, it sounds like there is a switch (1A or 2A) for charging current. Really, what it does it jump the voltage to push more current into the battery so that it will charge faster. Unfortunately, if it doesn't have a sensor and automatic shutoff, it will overcharge the battery and damage it. So it is possible to recharge such a battery in as little as 2 hours, even if completely drained. But you'll want to keep an eye on it to take it out when it's done. Also, rapid charges are convenient for (near) immediate use, but that convenience does cost in the overall life of the battery. Trickle charges at low current take longer, but extend battery life.

Depends on the mah capacity of the battery.

If It is 2000 mah, then divide that by the charging current 155/195 of the charger

= 12.9 hrs/10.2 hrs.