Probably a 1st year apprentice question, but can you substitute a NiCd battery of the same voltage/capacity in place of a NiMh without creating charging problems?
Probably OK in an EM fitting as most designs do just have a mix of constant voltage and then constant current.
If you have the fitting beside you , and can you tell me the cell size or Ah rating, and then put a meter in series and measure the on-charge current, and I can advise better.
The reverse, fitting a NimH cell where a NiCd used to go is quite common, and usually very successful, except in applications that push the cell hard for fast discharge or fast re-charge.
You may come unstuck if there is circuitry to report failing cells by measuring the cell impedance, as niCd are quite a bit 'droopier' on load, even when nothing is wrong, but having drooped, often have a higher short circuit current.
Probably OK in an EM fitting as most designs do just have a mix of constant voltage and then constant current.
If you have the fitting beside you , and can you tell me the cell size or Ah rating, and then put a meter in series and measure the on-charge current, and I can advise better.
The reverse, fitting a NimH cell where a NiCd used to go is quite common, and usually very successful, except in applications that push the cell hard for fast discharge or fast re-charge.
You may come unstuck if there is circuitry to report failing cells by measuring the cell impedance, as niCd are quite a bit 'droopier' on load, even when nothing is wrong, but having drooped, often have a higher short circuit current.
