You want 1. Lind Battery Utility and 2. Intelligent Battery Recondition, I think it's called. Used in conjunction (one will sometimes work while the other will not), they will very often, through repeated attempts, reawaken a 5xx-series battery.
Certain models, and in my experience, certain individual machines, will not work properly without a working backup battery. The 2400c is notorious for it, but Duos can be difficult also. I have not seen a problem with the 540c, but if you are getting GLOD, chances are that the machine is complaining about not having a backup battery.
They are very robust, and I have seen these backup batteries revive within the past 3-4 years in multiple machines, so there may not be need to replace what is in there.
The 2400c is a special pain because once the backup battery does die, there is seemingly no way to recharge the little devil, because the machine won't start up properly. The Catch-22 can only be resolved by popping in fresh backup cells that have a charge in them.
There are Varta cells that can be used as replacements in the 2400c-- I have a thread about that in here somewhere.
Certain models, and in my experience, certain individual machines, will not work properly without a working backup battery. The 2400c is notorious for it, but Duos can be difficult also. I have not seen a problem with the 540c, but if you are getting GLOD, chances are that the machine is complaining about not having a backup battery.
They are very robust, and I have seen these backup batteries revive within the past 3-4 years in multiple machines, so there may not be need to replace what is in there.
The 2400c is a special pain because once the backup battery does die, there is seemingly no way to recharge the little devil, because the machine won't start up properly. The Catch-22 can only be resolved by popping in fresh backup cells that have a charge in them.
There are Varta cells that can be used as replacements in the 2400c-- I have a thread about that in here somewhere.