Rechargeable cells work at 1.2 V?

I was looking at some AA size rechargeable cells from Uniross.


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in PDF document: "Leaflet for rechargeable batteries 2004")

This literature and their product wrapping seem to say that their NiMH cells deliver a maximum (nominal) voltage of only 1.2 V.

But I have some older NiMH cells (or maybe they are NiCd) cells which I measure at 1.35V.

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Maybe. The 1.35 V sounds like the peak (100% charged) voltage of a NiCad. After a small amount of use, NiCads drop to around 1.2 to 1.25 V.

This isn't as much of a problem as it would seem, since NiCads (and NiMH) have a much flatter voltage vs charge characteristic than typical alkaline cells, so while a 1.5 V alkaline will slowly ramp down to about

1.0 V at end of charge (depending on the device being powered of course), the rechargeable ones hang in at around 1.2 until almost fully discharged. So most equipment designed to work with alkalines will be designed to operate down below 1.2 V anyway.
Reply to
Paul Hovnanian P.E.

possibly nicads. the nimh cells are 1.2 volts. i have 210 of them on my electric motorcycle. sammmm

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Well, well.

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John Gilmer

I had a Radio Shack CB walkie-talkie years ago that required either 10 NiCd AA cells or 8 alkaline ones; the alkalines would be used with two "dummy cells" (basically a short circuit AA slug) so that they would still fit.

I guess they couldn't design the radio to run well on 10 volts. Which is probably annoying when using alkalines because it wouldn't take long for eight cells to discharge to 10 volts in normal use!


Paul Hovnanian P.E. wrote:

Reply to
Zorin the Lynx

Most devices either designed to work on ac or dc have a wide range of operating voltages.I have measured the voltage of the mains and is usually

220 V (here).While, most radios, walkmans etc.are designed to work either with alkaline or ni-cd batteries and use them to their full potential, thus until they are completely exhausted.There are many circuits to stabilize dc, as one learns in power electronics, including zener diodes, ICs transistors etc.

-- Tzortzakakis Dimitri?s major in electrical engineering, freelance electrician FH von Iraklion-Kreta, freiberuflicher Elektriker dimtzort AT otenet DOT gr ? "Zorin the Lynx" ?????? ??? ?????? news:cpj6m5$rj2$

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Dimitrios Tzortzakakis

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