owen
Well-Known Member
sorry for non boaty post. is there a diffrence between a charger for nicd batteries and one for nimh
rechargeable batteries non boaty
- Thread starter owen
- Start date
Evadne
Well-Known Member
No, not really.
andy_wilson
Well-Known Member
No, not really!
cameronke
Well-Known Member
One of my chargers has a NiCd / NiMH selector button another doesn't.
Sorry if this is not particularly informative
Often appliances say not to use NiCd batteries. I believe that is because thier voltage is lower than non-rechargeable ones. Anyone know if NiMH would be OK?
Cameron
Sorry if this is not particularly informative
Often appliances say not to use NiCd batteries. I believe that is because thier voltage is lower than non-rechargeable ones. Anyone know if NiMH would be OK?
Cameron
G
Guest
Guest
The statement by some manuals etc. to not use NiCds etc., can be based on :
a) The battery sensing indicator cannot work correctly with rechargeables as their output is virtually flat line till very near discharged.
or
b) Rechargeables are nominally lower voltage ... typical 1.25V against dry-cell 1.5V ... but under load they hold up closre to this with dry-cells dropping of significantly as they cannot "punch" as hard !
or
c) Voltage sensitive circuitry relies on the overall voltage beng close to nominal where load does not reduce voltage significantly ...
With b & c ... it is not unusual to see a rechargeable battery pack have 1 more or 1 less battery than the equivalent dry-cell pack.
I would IMHO and experience of basically ignoring all statements about this and placing Rechargeables in every battery powered item I have ... would say go ahead - stick rechargeables in. In preference NIMH or LiION ... and go for max capacity ........ some of mine are over 2500 mAhrs ... on AA's.
a) The battery sensing indicator cannot work correctly with rechargeables as their output is virtually flat line till very near discharged.
or
b) Rechargeables are nominally lower voltage ... typical 1.25V against dry-cell 1.5V ... but under load they hold up closre to this with dry-cells dropping of significantly as they cannot "punch" as hard !
or
c) Voltage sensitive circuitry relies on the overall voltage beng close to nominal where load does not reduce voltage significantly ...
With b & c ... it is not unusual to see a rechargeable battery pack have 1 more or 1 less battery than the equivalent dry-cell pack.
I would IMHO and experience of basically ignoring all statements about this and placing Rechargeables in every battery powered item I have ... would say go ahead - stick rechargeables in. In preference NIMH or LiION ... and go for max capacity ........ some of mine are over 2500 mAhrs ... on AA's.
Evadne
Well-Known Member
For the charging and discharging, Ni-Cd is essentially identical to NiMH. The main differences are cost, charging cycles and capacity. NiMH is higher in all three.
Regarding rechargeables and primary cells, the difference in voltage shouldn't matter on a properly designed device, as a manganese alkaline end-point is 0.9V (starts at ~1.5V) whereas a NiCd is pretty flat around 1.2V. There is a difference in internal resistance, which means that the rechargeable can supply more current. This can affect devices that use unregulated battery power, such as primitive flash guns or radio transmitters, but you'd be unlucky to damage a modern device by fitting rechargeables instead of manganese alkalines.
Regarding rechargeables and primary cells, the difference in voltage shouldn't matter on a properly designed device, as a manganese alkaline end-point is 0.9V (starts at ~1.5V) whereas a NiCd is pretty flat around 1.2V. There is a difference in internal resistance, which means that the rechargeable can supply more current. This can affect devices that use unregulated battery power, such as primitive flash guns or radio transmitters, but you'd be unlucky to damage a modern device by fitting rechargeables instead of manganese alkalines.
Evadne
Well-Known Member
/forums/images/graemlins/smile.gif snap!
cameronke
Well-Known Member
Thanks Nigel, Thanks Dave
Regards
Cameron
Regards
Cameron
owen
Well-Known Member
thanks for all replies much appreciated