Re: ROHS directive and electric vehicles?


"Rich Grise" <rich@xxxxxxxxxxx> wrote in message
news:pan.2006.08.07.18.13.59.292673@xxxxxxxxxxxxxx
On Sun, 06 Aug 2006 02:45:12 +0000, joseph2k wrote:
CWatters wrote:
"conundrum" <testing_h@xxxxxxxxx> wrote in message

Hi all.

Seems that the EU have again shot themselves in the foot by totally
banning NiCad batteries,

NiMH cells are just about as good as NiCad these days. The model
car/plane
boys have all switched over. NiMH cells can supply quite high current.

About as good as? Hell, they have about twice the power density of
NiCad;
volumetric or mass.

Oh, yeah, sure. NiMH have LOTS of capacity - but a shelf life that you
could measure in hours.

I just tossed 8x AA NiMH cells that I had been using for my little
digital camera. I don't use it that often, and every time I pick it up,
the batteries have gone dead, so I have to replace them, and when I
put in the next set, it lasts a few minutes and dies. I got one set
of 4x AA's with the charger for about $15.00, and they worked real good
at first, so I bought another set of 4X AA's. It's been about six months
now, maybe a year, and the stupid NiMH's won't even hold a f***ing charge
any more, so I tossed them. I haven't tossed the charger, because it
claims to be a "universal", and one day I might try some NiCd's in it,
but I'll never buy another NiMH battery until somebody reports that they
have an acceptable shelf life.

Thanks,
Rich


For digital camera batteries I am experimenting with the D.O.L. inverter
ripped from a scrap Philishave, it charges the battery from a high frequency
inverter with just a rectifier diode and no smoothing cap, this arrangement
works extremely well with NiCd and may also improve charging performance
with NiMh. The inverter is controlled by a TEA1088T chip which senses the
slight drop in terminal voltage that NiCd's show at the full charge point,
but NiMh has a less pronounced drop and some pairs of cells trip the full
charge change to trickle charge while others don't. So far NiMh cells
charged with this hold the battery charge symbol in the display as showing
full during flash chargeup which conventionally charged cells don't! At the
moment the charger has to be supervised when charging NiMh but when I get
bored enough I might build a simple temperature controlled trip to shut it
down at full charge.


.

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