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nicad battery packs

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sqweaka22/07/2020 10:24:19
38 forum posts
4 photos

Question... can you no longer buy nicad battery packs for rx's/tx's now? i feel like buck rogers awakening after a long sleep

Richard Wills 222/07/2020 10:36:43
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259 forum posts
7 photos

phased out and replaced with nimh batteries on toxicity grounds,

John Wagg22/07/2020 10:38:34
134 forum posts
22 photos

Ni-Cad packs are available from Ebay but are frowned upon for environmental reasons. I only buy NiMh now and have quite a few packs. I just treat the NiMh's like Ni-cads and no problems so far.

Martin Harris22/07/2020 10:41:26
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9596 forum posts
258 photos

More's the pity...

Although they are still made in the Far East, EU rules don't allow them to be sold - and we're still following the bulk of legislation passed by them.

Edit: John got there first!

Edited By Martin Harris on 22/07/2020 10:42:31

Steve J22/07/2020 10:42:06
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2105 forum posts
61 photos
Posted by sqweaka on 22/07/2020 10:24:19:

Question... can you no longer buy nicad battery packs for rx's/tx's now?

People can't be trusted to dispose of NiCad cells properly.

For AAA's and AA's, I recommend Eneloops.

Edited By Steve J on 22/07/2020 10:42:19

sqweaka22/07/2020 10:54:37
38 forum posts
4 photos

wondered why my searches showed no items found!

so you need to buy a different charger for your transmitter for the new nimh packs?

Allan Bennett22/07/2020 11:00:42
1775 forum posts
55 photos

I've used NiMh for many years, with the same original Futaba Tx/Rx charger. Charging regime is the same as for NiCd.

gangster22/07/2020 11:11:35
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1061 forum posts
29 photos

Yes just pretend they are nicad you really won’t notice much difference and continue to use the slow chargers that came with the radio. However be careful of the exorbitant capacity claims on some now you cannot get a quart in a pint pot. Just pretend that they are the old 500/600 that you had before and you will be fine

Steve J22/07/2020 11:30:34
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2105 forum posts
61 photos
Posted by sqweaka on 22/07/2020 10:54:37:

so you need to buy a different charger for your transmitter for the new nimh packs?

No.

Buy an Eneloop pack from Component Shop (or elsewhere) and use your existing wall wart charger.

If you left the battery discharged in the transmitter, I would have a good check for corrosion before spending money on a new battery.

Edited By Steve J on 22/07/2020 11:36:15

Peter Christy22/07/2020 12:23:57
1921 forum posts

Just bear in mind that a new pack of Eneloops will have between 3 and 4 times the capacity of your old NiCads. If you run them flat, they will take a lot longer to fully charge on your old charger.

As long as you are aware of this, then fine, carry on as normal. But also Eneloops can be "fast charged" in an hour or so, but for that you need a modern "peak detect" charger.

I would recommend a peak detect charger anyway, as it prevents overcharging - one of the main causes of the dreaded "black wire corrosion"!

--

Pete

sqweaka22/07/2020 12:48:06
38 forum posts
4 photos
Posted by Peter Christy on 22/07/2020 12:23:57:

Just bear in mind that a new pack of Eneloops will have between 3 and 4 times the capacity of your old NiCads. If you run them flat, they will take a lot longer to fully charge on your old charger.

As long as you are aware of this, then fine, carry on as normal. But also Eneloops can be "fast charged" in an hour or so, but for that you need a modern "peak detect" charger.

I would recommend a peak detect charger anyway, as it prevents overcharging - one of the main causes of the dreaded "black wire corrosion"!

--

Pete

ah... ive just found in the loft an old ripmax ac/dc peak detect nicad/nimh charger i forgot i couldn't sell when i got rid of all my old gear ... result!

Keith Miles 222/07/2020 13:05:41
501 forum posts
6 photos

As said, NiMh cells can be treated in pretty much the same way as NiCd although if the charger has a dedicated NiMh charge facility, best to use that, of course.

They are more environmentally friendly and also do not suffer from the NiCd “memory effect” (reducing capacity over time due to “top-up charging).

”Eneloop” are definitely the best choice for their low self-discharge qualities making for fuss free long term storage at full charge. If you can do an annual recycle, so much the better.

Edited By Keith Miles 2 on 22/07/2020 13:14:26

Richard Clark 222/07/2020 18:26:43
424 forum posts

If using an old fast charger make sure it can be set to 'Nimh'. as the peak is much smaller than Nicad so if not set the charger may not detect the peak and keep charging until an Nimh battery gets very hot and blows up or melts

sqweaka22/07/2020 18:56:30
38 forum posts
4 photos
Posted by Richard Clark 2 on 22/07/2020 18:26:43:

If using an old fast charger make sure it can be set to 'Nimh'. as the peak is much smaller than Nicad so if not set the charger may not detect the peak and keep charging until an Nimh battery gets very hot and blows up or melts

The charger has a switch for Nicad or Nimh, so should be good Richard

Denis Watkins22/07/2020 20:29:18
4655 forum posts
132 photos
Posted by sqweaka on 22/07/2020 10:24:19:

Question... can you no longer buy nicad battery packs for rx's/tx's now? i feel like buck rogers awakening after a long sleep

Flying not changed though, out in the fresh air, flying your pride and joy

with all the banter from the crew

Martin Harris23/07/2020 11:41:45
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9596 forum posts
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Posted by Peter Christy on 22/07/2020 12:23:57:

I would recommend a peak detect charger anyway, as it prevents overcharging - one of the main causes of the dreaded "black wire corrosion"!

Don't underestimate the effects of black wire corrosion.

Practicing what I preach, I still use a number of old but good quality NiCads, which I test regularly. I fished one out of an electric glider (which uses a non-BEC ESC) to cycle check it and the charger rejected it repeatedly although it showed a resting voltage of over 4 volts after 9 months or so of storage (I should really have discharged it to 1V per cell but hadn't bargained for COVID-19!) I have no idea how old it is - I inherited it in another model many years ago and it's kept its capacity well as measured during my regular tests.

Anyway, before consigning the old faithful to the tidy tip battery collection point, I thought I'd just check it over and the black wire corrosion had to be seen to be believed! The negative conductors were more black powder than copper wire strands and no doubt the high resistance was the cause of the charger saying no as soon as any meaningful current attempted to flow. I'm wondering whether storage in the loft during the high temperatures experienced during the lockdown may have accelerated the corrosion process - normally it would have been out of the loft as soon as the thermals started popping.

I boshed on a new power lead and it's currently taking a seemingly normal charge. Next step will be to check the switch harness - luckily I'd removed the receiver several months ago to put in another model I was building.

I'll give it a couple of cycles and see if it still performs properly - I suspect it will. An old rechargeable torch, inherited from work, still holds a decent charge on its @ 35 year old NiCad pack.

I took a look in my bag of "dead" NiCads waiting for proper disposal and the first one I checked was showing definite signs of advanced black wire corrosion - it's been in my outside garage for some time, which may have caused this but it does make me wonder how many serviceable NiCads have been discarded over the years for want of a bit of maintenance...

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