Electronics > Beginners
How to charge NiMh batteries?
Chris Wilson:
The dedicated charger for a dog tracker collar has failed so I need to charge the battery pack external from the collar. It comprise two 1.2V 2/3 AA 600mAH batteries in series. The manufacturer of the cells is Emmerich.
I have current / voltage limited bench supplies, decent multimeters etcetera, will I be able to charge this pack divorced from a coller safely somehow please? Thanks :)
FreddieChopin:
You could buy a cheap poundland iMax B6 charger clone. It has LiPo mode normally but it can also do NiMH, lead-acid, car battery etc.
JustMeHere:
This might work:
MosherIV:
NiMh can be charged with CV.
2 cells in series gives 2.4V
Set the psu to 3V and limit the current to 60mA. Should take about 10 hours to charge.
If the cells state the max charge current, you can set the current limit to that.
Keep an eye on cell temps, if it gets too hot to touch - stop immediately.
Andreas:
Hello,
I would use 1.4-1.45V/cell as voltage limit (@20 deg C) and a diode to prevent discharging in case the power supply (mains line) fails.
So total voltage including diode ~3.4-3.5V. Depends on room temperature: with higher room temperature you have to decrease voltage.
(~3mV/deg C and cell)
Current can be increased to ~0.15A (C/4) with voltage limit.
with best regards
Andreas
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