I read on the web that to know the charging time of a ni-cd baterry i should ude this formula:

1.4 x (baterry mah's) / (charger ma's) = charging time

In my case:

1.4 x 1800 / 1000 = 2.52 around 2:30h of charging time

Is this formula correct? I don't have a smart charger/digital charger.

Cheers.