HP Forum Archive 06

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Radio Shack NiMH N cell Message #1 Posted by Brian on 6 Oct 2001, 12:08 a.m. Found this on the Canadian Radio Shack website. 360mAh NiMH N cell. I'll have to visit the local Radio Shack tomorrow. See this link: http://www.radioshack.ca/images/cat01l/2300521l.jpg Radio Shack catalog no. 23-521 I'm still hunting for a distributor that carries the Gold Peak 500mAh NiMH N cells ( GP50NH ).

Re: Radio Shack NiMH N cell Message #2 Posted by db(martinez,california) on 6 Oct 2001, 9:49 p.m., in response to message #1 by Brian they exist at every store. and if your lucky you can still find ni-cad n cells clearance priced at $1.99 for two but, they have no charger for n cells. do you know where to get one or what to adapt?

Re: Radio Shack NiMH N cell Message #3 Posted by Brian on 6 Oct 2001, 10:46 p.m., in response to message #2 by db(martinez,california) I grabbed the last 4 packs on sale for $2.99 ea. at a nearby Radio Shack. My old HP92266A N cell trickle charger wall transformer died many years ago but its battery holder works fine with my variable DC power supply. Inside the battery holder is a 69 ohm resistor and a little LED across it. Thats all the components in the battery holder. Any trickle charger that charges AAA size NiCad batteries should work fine as long as the charger instructions states 'trickle' and a charging time of 12-15 hours. Just add a metal spacer to keep the N cell firmly in contact with the charger terminals. Don't use a medium rate or high rate NiCad battery charger. The charge rate should be about 0.1C ( 0.1 X 360mAh = 36mAh ) for about 12 hours.

thanks...... Message #4 Posted by db(martinez,california) on 7 Oct 2001, 11:38 p.m., in response to message #3 by Brian .....a bunch.

Re: Radio Shack NiMH N cell Message #5 Posted by mikeu on 21 Oct 2001, 12:59 a.m., in response to message #2 by db(martinez,california) Many years ago I picked up a Radio Shack charger and some plastic adapters called an "N charging module" (also from RS) It is about the size and shape of an AA cell with a place to insert the N battery. Not sure if they are still available, or what the part number is.

Radio Shack N cell holder Message #6 Posted by Brian on 21 Oct 2001, 1:53 p.m., in response to message #5 by mikeu Radio Shack N Cell holder. Catalog #270-405 My local Radio Shack has them in stock.

Re: Radio Shack N cell holder Message #7 Posted by db(martinez,california) on 21 Oct 2001, 11:33 p.m., in response to message #6 by Brian thanks. i'll see if they can order four tomorrow, and a real slow charger to match it.

Re: Radio Shack N cell holder Message #8 Posted by Brian on 22 Oct 2001, 9:14 p.m., in response to message #7 by db(martinez,california) This N cell holder is just a plastic holder with two leads. It's not for inserting in a charger. You still might be able to wire the holders to a AAA NiMH charger. I would include terminals to monitor the current to the N cell holder.

Re: Radio Shack N cell holder Message #9 Posted by db(martinez,california) on 22 Oct 2001, 11:18 p.m., in response to message #8 by Brian brian; the store here in river city had three. jim is getting me another. i'm thinking about a +/- 1.6 vdc at 60 ma and wire it paralel for about a 14 hour charge or am i missing something? this setup might work for a nimh, with a different time. but i'll worry about that in six years when these ni-cads are dead. thanks again - d

NiCad charger for N cells Message #10 Posted by Brian on 23 Oct 2001, 11:47 p.m., in response to message #9 by db(martinez,california) Don't charge batteries in parallel. Charge as two in series or four in series or individually. If you are charging NiCad N cells, limit the charging current to about C/5 or 30 mA ( for 150 mAh N cells ). This charging current is the same if you have one or more NiCad N cells in series. Here's a good NiCad charger circuit link: http://www.dprg.org/nicad_charger.html

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