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04-25-2013 03:18 PM  7 years ago
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deiniolpook

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West Wales, UK

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NiMH Charging
Hi all, I've only noticed today that when I'm charging say for example my glow-stick using my chargers NiMH 'auto' program every so often the charge current drops to zero for a few seconds before returning to the previous level.

Is this correct behaviour for a charger when in NiMH automatic mode??
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04-25-2013 04:56 PM  7 years ago
JKos

rrProfessor

Redondo Beach, CA

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It completely depends on your charger. What charger are you using?

Different companies have come up with different ways to skin the same cat (charging NiMH batteries).

- John
RR rules!
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04-25-2013 05:06 PM  7 years ago
deiniolpook

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West Wales, UK

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I'm using an Ansmann Racing xBase 2.0 Deluxe.

http://www.modelsport.co.uk/ansmann...-products/38403]
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04-25-2013 07:02 PM  7 years ago
Four Stroker

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Atlanta

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A good charge algorithm will measure the voltage when there is no current. This avoids the resistance of the wiring and plugs, etc. Many chargers do this pulse technique but you don't see it because they don't update the display.
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04-25-2013 07:10 PM  7 years ago
deiniolpook

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West Wales, UK

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Ok, so an occasional drop to zero current during charging is perfectly normal. I didn't know if the charger had a fault.
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04-25-2013 07:48 PM  7 years ago
JKos

rrProfessor

Redondo Beach, CA

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Yes, it does sound fairly normal. What FS said is exactly true. Since NiMH packs do not have balancing leads, the charger does not know the true voltage of the pack while current is flowing. The voltage as read at the output terminals of the charger will be higher than the cell or pack itself due to voltage drops in the wiring and internal resistance of the cell/pack as well.

When NiCd and NiMH packs were all the rage, several charging algorithms came about by various charger companies. All of which claimed their method was better.

- John
RR rules!
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