1995 Rover 2 Series battery problems

Hey there. I have a problem with battery charge. I have diagnosed the problem so will keep it brief for your sake. The battery will not hold charge(have recharged it from dead state/went flat after a few hours with engine switched off). The battery check light does not illuminate during start up (have changed lamp/not a blown bulb). Therefore the charging system is in a total loss operational condition. I would like to know if you have a solution or an indication as to where the problem lies and what is needed to be done to fix the problem.
thank you in advance.
martin.